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Finding the Fourth Proportional to 151.26, 209.16 and 129.66

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Solution

The fourth proportional to 151.26, 209.16 and 129.66 is: 179.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.26 : 209.16 = 129.66 : x
  2. Step 2: Convert to fraction form
    151.26/209.16 = 129.66/x
  3. Step 3: Cross multiply
    151.26x = 209.16 × 129.66
  4. Step 4: Simplify right side
    151.26x = 27,119.69
  5. Step 5: Solve for x
    x = 27,119.69/151.26
  6. Step 6: Final answer
    x = 179.29

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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.