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Finding the Fourth Proportional to 115.31, 158.70 and 91.92

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Solution

The fourth proportional to 115.31, 158.70 and 91.92 is: 126.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.31 : 158.70 = 91.92 : x
  2. Step 2: Convert to fraction form
    115.31/158.70 = 91.92/x
  3. Step 3: Cross multiply
    115.31x = 158.70 × 91.92
  4. Step 4: Simplify right side
    115.31x = 14,588.20
  5. Step 5: Solve for x
    x = 14,588.20/115.31
  6. Step 6: Final answer
    x = 126.51

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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.