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Finding the Fourth Proportional to 457.75, 686.64 and 115.75

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Solution

The fourth proportional to 457.75, 686.64 and 115.75 is: 173.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.75 : 686.64 = 115.75 : x
  2. Step 2: Convert to fraction form
    457.75/686.64 = 115.75/x
  3. Step 3: Cross multiply
    457.75x = 686.64 × 115.75
  4. Step 4: Simplify right side
    457.75x = 79,478.58
  5. Step 5: Solve for x
    x = 79,478.58/457.75
  6. Step 6: Final answer
    x = 173.63

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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.