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Finding the Fourth Proportional to 111.65, 167.55 and 81.14

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Solution

The fourth proportional to 111.65, 167.55 and 81.14 is: 121.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.65 : 167.55 = 81.14 : x
  2. Step 2: Convert to fraction form
    111.65/167.55 = 81.14/x
  3. Step 3: Cross multiply
    111.65x = 167.55 × 81.14
  4. Step 4: Simplify right side
    111.65x = 13,595.43
  5. Step 5: Solve for x
    x = 13,595.43/111.65
  6. Step 6: Final answer
    x = 121.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.