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Finding the Fourth Proportional to 115.74, 159.39 and 113.22

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Solution

The fourth proportional to 115.74, 159.39 and 113.22 is: 155.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.74 : 159.39 = 113.22 : x
  2. Step 2: Convert to fraction form
    115.74/159.39 = 113.22/x
  3. Step 3: Cross multiply
    115.74x = 159.39 × 113.22
  4. Step 4: Simplify right side
    115.74x = 18,046.16
  5. Step 5: Solve for x
    x = 18,046.16/115.74
  6. Step 6: Final answer
    x = 155.92

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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.