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Finding the Fourth Proportional to 115.47, 158.85 and 99.81

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Solution

The fourth proportional to 115.47, 158.85 and 99.81 is: 137.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.47 : 158.85 = 99.81 : x
  2. Step 2: Convert to fraction form
    115.47/158.85 = 99.81/x
  3. Step 3: Cross multiply
    115.47x = 158.85 × 99.81
  4. Step 4: Simplify right side
    115.47x = 15,854.82
  5. Step 5: Solve for x
    x = 15,854.82/115.47
  6. Step 6: Final answer
    x = 137.31

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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.