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Finding the Fourth Proportional to 116.85, 161.13 and 81.87

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Solution

The fourth proportional to 116.85, 161.13 and 81.87 is: 112.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.85 : 161.13 = 81.87 : x
  2. Step 2: Convert to fraction form
    116.85/161.13 = 81.87/x
  3. Step 3: Cross multiply
    116.85x = 161.13 × 81.87
  4. Step 4: Simplify right side
    116.85x = 13,191.72
  5. Step 5: Solve for x
    x = 13,191.72/116.85
  6. Step 6: Final answer
    x = 112.89

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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.