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Finding the Fourth Proportional to 129.31, 177.40 and 127.15

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Solution

The fourth proportional to 129.31, 177.40 and 127.15 is: 174.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.31 : 177.40 = 127.15 : x
  2. Step 2: Convert to fraction form
    129.31/177.40 = 127.15/x
  3. Step 3: Cross multiply
    129.31x = 177.40 × 127.15
  4. Step 4: Simplify right side
    129.31x = 22,555.77
  5. Step 5: Solve for x
    x = 22,555.77/129.31
  6. Step 6: Final answer
    x = 174.43

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.