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Finding the Fourth Proportional to 457.91, 686.87 and 111.25

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Solution

The fourth proportional to 457.91, 686.87 and 111.25 is: 166.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.91 : 686.87 = 111.25 : x
  2. Step 2: Convert to fraction form
    457.91/686.87 = 111.25/x
  3. Step 3: Cross multiply
    457.91x = 686.87 × 111.25
  4. Step 4: Simplify right side
    457.91x = 76,411.46
  5. Step 5: Solve for x
    x = 76,411.46/457.91
  6. Step 6: Final answer
    x = 166.87

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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.