Home / 1,278,138,857.60-1,917,208,286.40-842,782,390.40

Finding the Fourth Proportional to 1,278,138,857.60, 1,917,208,286.40 and 842,782,390.40

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Solution

The fourth proportional to 1,278,138,857.60, 1,917,208,286.40 and 842,782,390.40 is: 1,264,173,585.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278,138,857.60 : 1,917,208,286.40 = 842,782,390.40 : x
  2. Step 2: Convert to fraction form
    1,278,138,857.60/1,917,208,286.40 = 842,782,390.40/x
  3. Step 3: Cross multiply
    1,278,138,857.60x = 1,917,208,286.40 × 842,782,390.40
  4. Step 4: Simplify right side
    1,278,138,857.60x = 1,615,789,382,506,879,744
  5. Step 5: Solve for x
    x = 1,615,789,382,506,879,744/1,278,138,857.60
  6. Step 6: Final answer
    x = 1,264,173,585.60

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.