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Finding the Fourth Proportional to 457.31, 685.97 and 115.31

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Solution

The fourth proportional to 457.31, 685.97 and 115.31 is: 172.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    457.31 : 685.97 = 115.31 : x
  2. Step 2: Convert to fraction form
    457.31/685.97 = 115.31/x
  3. Step 3: Cross multiply
    457.31x = 685.97 × 115.31
  4. Step 4: Simplify right side
    457.31x = 79,100.77
  5. Step 5: Solve for x
    x = 79,100.77/457.31
  6. Step 6: Final answer
    x = 172.97

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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.