Home / 778,086.25-1,073,759.03-420,390.25

Finding the Fourth Proportional to 778,086.25, 1,073,759.03 and 420,390.25

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Solution

The fourth proportional to 778,086.25, 1,073,759.03 and 420,390.25 is: 580,138.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    778,086.25 : 1,073,759.03 = 420,390.25 : x
  2. Step 2: Convert to fraction form
    778,086.25/1,073,759.03 = 420,390.25/x
  3. Step 3: Cross multiply
    778,086.25x = 1,073,759.03 × 420,390.25
  4. Step 4: Simplify right side
    778,086.25x = 451,397,824,959.51
  5. Step 5: Solve for x
    x = 451,397,824,959.51/778,086.25
  6. Step 6: Final answer
    x = 580,138.55

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Half scale
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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.