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Finding the Fourth Proportional to 116.82, 161.31 and 87.86

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Solution

The fourth proportional to 116.82, 161.31 and 87.86 is: 121.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.82 : 161.31 = 87.86 : x
  2. Step 2: Convert to fraction form
    116.82/161.31 = 87.86/x
  3. Step 3: Cross multiply
    116.82x = 161.31 × 87.86
  4. Step 4: Simplify right side
    116.82x = 14,172.70
  5. Step 5: Solve for x
    x = 14,172.70/116.82
  6. Step 6: Final answer
    x = 121.32

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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.