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Finding the Fourth Proportional to 115.87, 159.96 and 91.39

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Solution

The fourth proportional to 115.87, 159.96 and 91.39 is: 126.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.87 : 159.96 = 91.39 : x
  2. Step 2: Convert to fraction form
    115.87/159.96 = 91.39/x
  3. Step 3: Cross multiply
    115.87x = 159.96 × 91.39
  4. Step 4: Simplify right side
    115.87x = 14,618.74
  5. Step 5: Solve for x
    x = 14,618.74/115.87
  6. Step 6: Final answer
    x = 126.17

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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.