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Finding the Fourth Proportional to 151.31, 226.79 and 86.23

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Solution

The fourth proportional to 151.31, 226.79 and 86.23 is: 129.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.31 : 226.79 = 86.23 : x
  2. Step 2: Convert to fraction form
    151.31/226.79 = 86.23/x
  3. Step 3: Cross multiply
    151.31x = 226.79 × 86.23
  4. Step 4: Simplify right side
    151.31x = 19,554.97
  5. Step 5: Solve for x
    x = 19,554.97/151.31
  6. Step 6: Final answer
    x = 129.24

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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.