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Finding the Fourth Proportional to 457.39, 686.11 and 132.79

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Solution

The fourth proportional to 457.39, 686.11 and 132.79 is: 199.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.39 : 686.11 = 132.79 : x
  2. Step 2: Convert to fraction form
    457.39/686.11 = 132.79/x
  3. Step 3: Cross multiply
    457.39x = 686.11 × 132.79
  4. Step 4: Simplify right side
    457.39x = 91,105.12
  5. Step 5: Solve for x
    x = 91,105.12/457.39
  6. Step 6: Final answer
    x = 199.18

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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.