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Finding the Fourth Proportional to 115.44, 159.31 and 66.31

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Solution

The fourth proportional to 115.44, 159.31 and 66.31 is: 91.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.44 : 159.31 = 66.31 : x
  2. Step 2: Convert to fraction form
    115.44/159.31 = 66.31/x
  3. Step 3: Cross multiply
    115.44x = 159.31 × 66.31
  4. Step 4: Simplify right side
    115.44x = 10,563.73
  5. Step 5: Solve for x
    x = 10,563.73/115.44
  6. Step 6: Final answer
    x = 91.51

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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.