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Finding the Fourth Proportional to 129, 177.90 and 115.92

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Solution

The fourth proportional to 129, 177.90 and 115.92 is: 159.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    129 : 177.90 = 115.92 : x
  2. Step 2: Convert to fraction form
    129/177.90 = 115.92/x
  3. Step 3: Cross multiply
    129x = 177.90 × 115.92
  4. Step 4: Simplify right side
    129x = 20,622.17
  5. Step 5: Solve for x
    x = 20,622.17/129
  6. Step 6: Final answer
    x = 159.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.