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Finding the Fourth Proportional to 159.17, 238.59 and 77.90

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Solution

The fourth proportional to 159.17, 238.59 and 77.90 is: 116.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.17 : 238.59 = 77.90 : x
  2. Step 2: Convert to fraction form
    159.17/238.59 = 77.90/x
  3. Step 3: Cross multiply
    159.17x = 238.59 × 77.90
  4. Step 4: Simplify right side
    159.17x = 18,584.97
  5. Step 5: Solve for x
    x = 18,584.97/159.17
  6. Step 6: Final answer
    x = 116.77

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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.