Home / 879,339.60-1,319,009.40-643,143.60

Finding the Fourth Proportional to 879,339.60, 1,319,009.40 and 643,143.60

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Solution

The fourth proportional to 879,339.60, 1,319,009.40 and 643,143.60 is: 964,715.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    879,339.60 : 1,319,009.40 = 643,143.60 : x
  2. Step 2: Convert to fraction form
    879,339.60/1,319,009.40 = 643,143.60/x
  3. Step 3: Cross multiply
    879,339.60x = 1,319,009.40 × 643,143.60
  4. Step 4: Simplify right side
    879,339.60x = 848,312,453,949.84
  5. Step 5: Solve for x
    x = 848,312,453,949.84/879,339.60
  6. Step 6: Final answer
    x = 964,715.40

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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.