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Finding the Fourth Proportional to 116.91, 161.24 and 103.11

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Solution

The fourth proportional to 116.91, 161.24 and 103.11 is: 142.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.91 : 161.24 = 103.11 : x
  2. Step 2: Convert to fraction form
    116.91/161.24 = 103.11/x
  3. Step 3: Cross multiply
    116.91x = 161.24 × 103.11
  4. Step 4: Simplify right side
    116.91x = 16,624.92
  5. Step 5: Solve for x
    x = 16,624.92/116.91
  6. Step 6: Final answer
    x = 142.20

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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.