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Finding the Fourth Proportional to 391,871.12, 540,793.32 and 238,918.16

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Solution

The fourth proportional to 391,871.12, 540,793.32 and 238,918.16 is: 329,713.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,871.12 : 540,793.32 = 238,918.16 : x
  2. Step 2: Convert to fraction form
    391,871.12/540,793.32 = 238,918.16/x
  3. Step 3: Cross multiply
    391,871.12x = 540,793.32 × 238,918.16
  4. Step 4: Simplify right side
    391,871.12x = 129,205,344,954.69
  5. Step 5: Solve for x
    x = 129,205,344,954.69/391,871.12
  6. Step 6: Final answer
    x = 329,713.87

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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.