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Finding the Fourth Proportional to 159.66, 239.54 and 91.17

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Solution

The fourth proportional to 159.66, 239.54 and 91.17 is: 136.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.66 : 239.54 = 91.17 : x
  2. Step 2: Convert to fraction form
    159.66/239.54 = 91.17/x
  3. Step 3: Cross multiply
    159.66x = 239.54 × 91.17
  4. Step 4: Simplify right side
    159.66x = 21,838.41
  5. Step 5: Solve for x
    x = 21,838.41/159.66
  6. Step 6: Final answer
    x = 136.78

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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.