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Finding the Fourth Proportional to 457.81, 686.72 and 115.81

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Solution

The fourth proportional to 457.81, 686.72 and 115.81 is: 173.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.81 : 686.72 = 115.81 : x
  2. Step 2: Convert to fraction form
    457.81/686.72 = 115.81/x
  3. Step 3: Cross multiply
    457.81x = 686.72 × 115.81
  4. Step 4: Simplify right side
    457.81x = 79,529.04
  5. Step 5: Solve for x
    x = 79,529.04/457.81
  6. Step 6: Final answer
    x = 173.72

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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.