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Finding the Fourth Proportional to 714,149.70, 985,493.61 and 391,851.78

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Solution

The fourth proportional to 714,149.70, 985,493.61 and 391,851.78 is: 540,737.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    714,149.70 : 985,493.61 = 391,851.78 : x
  2. Step 2: Convert to fraction form
    714,149.70/985,493.61 = 391,851.78/x
  3. Step 3: Cross multiply
    714,149.70x = 985,493.61 × 391,851.78
  4. Step 4: Simplify right side
    714,149.70x = 386,167,425,257.13
  5. Step 5: Solve for x
    x = 386,167,425,257.13/714,149.70
  6. Step 6: Final answer
    x = 540,737.36

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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.