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Finding the Fourth Proportional to 115.97, 159.99 and 71.69

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Solution

The fourth proportional to 115.97, 159.99 and 71.69 is: 98.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.97 : 159.99 = 71.69 : x
  2. Step 2: Convert to fraction form
    115.97/159.99 = 71.69/x
  3. Step 3: Cross multiply
    115.97x = 159.99 × 71.69
  4. Step 4: Simplify right side
    115.97x = 11,470.08
  5. Step 5: Solve for x
    x = 11,470.08/115.97
  6. Step 6: Final answer
    x = 98.90

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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.