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Finding the Fourth Proportional to 159.71, 239.31 and 91.13

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Solution

The fourth proportional to 159.71, 239.31 and 91.13 is: 136.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.71 : 239.31 = 91.13 : x
  2. Step 2: Convert to fraction form
    159.71/239.31 = 91.13/x
  3. Step 3: Cross multiply
    159.71x = 239.31 × 91.13
  4. Step 4: Simplify right side
    159.71x = 21,807.12
  5. Step 5: Solve for x
    x = 21,807.12/159.71
  6. Step 6: Final answer
    x = 136.55

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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.