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Finding the Fourth Proportional to 661,505.10, 992,257.65 and 392,066.70

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Solution

The fourth proportional to 661,505.10, 992,257.65 and 392,066.70 is: 588,100.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,505.10 : 992,257.65 = 392,066.70 : x
  2. Step 2: Convert to fraction form
    661,505.10/992,257.65 = 392,066.70/x
  3. Step 3: Cross multiply
    661,505.10x = 992,257.65 × 392,066.70
  4. Step 4: Simplify right side
    661,505.10x = 389,031,182,385.26
  5. Step 5: Solve for x
    x = 389,031,182,385.26/661,505.10
  6. Step 6: Final answer
    x = 588,100.05

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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.