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Finding the Fourth Proportional to 159.68, 239.70 and 127.76

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Solution

The fourth proportional to 159.68, 239.70 and 127.76 is: 191.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.68 : 239.70 = 127.76 : x
  2. Step 2: Convert to fraction form
    159.68/239.70 = 127.76/x
  3. Step 3: Cross multiply
    159.68x = 239.70 × 127.76
  4. Step 4: Simplify right side
    159.68x = 30,624.07
  5. Step 5: Solve for x
    x = 30,624.07/159.68
  6. Step 6: Final answer
    x = 191.78

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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.