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Finding the Fourth Proportional to 487,003.40, 730,505.10 and 398,429.90

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Solution

The fourth proportional to 487,003.40, 730,505.10 and 398,429.90 is: 597,644.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,003.40 : 730,505.10 = 398,429.90 : x
  2. Step 2: Convert to fraction form
    487,003.40/730,505.10 = 398,429.90/x
  3. Step 3: Cross multiply
    487,003.40x = 730,505.10 × 398,429.90
  4. Step 4: Simplify right side
    487,003.40x = 291,055,073,942.49
  5. Step 5: Solve for x
    x = 291,055,073,942.49/487,003.40
  6. Step 6: Final answer
    x = 597,644.85

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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.