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Finding the Fourth Proportional to 115.39, 159.20 and 80.38

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Solution

The fourth proportional to 115.39, 159.20 and 80.38 is: 110.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.39 : 159.20 = 80.38 : x
  2. Step 2: Convert to fraction form
    115.39/159.20 = 80.38/x
  3. Step 3: Cross multiply
    115.39x = 159.20 × 80.38
  4. Step 4: Simplify right side
    115.39x = 12,795.70
  5. Step 5: Solve for x
    x = 12,795.70/115.39
  6. Step 6: Final answer
    x = 110.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.