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Finding the Fourth Proportional to 129.26, 177.92 and 108.31

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Solution

The fourth proportional to 129.26, 177.92 and 108.31 is: 149.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.26 : 177.92 = 108.31 : x
  2. Step 2: Convert to fraction form
    129.26/177.92 = 108.31/x
  3. Step 3: Cross multiply
    129.26x = 177.92 × 108.31
  4. Step 4: Simplify right side
    129.26x = 19,270.52
  5. Step 5: Solve for x
    x = 19,270.52/129.26
  6. Step 6: Final answer
    x = 149.08

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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.