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Finding the Fourth Proportional to 166.10, 249.15 and 74.75

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Solution

The fourth proportional to 166.10, 249.15 and 74.75 is: 112.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    166.10 : 249.15 = 74.75 : x
  2. Step 2: Convert to fraction form
    166.10/249.15 = 74.75/x
  3. Step 3: Cross multiply
    166.10x = 249.15 × 74.75
  4. Step 4: Simplify right side
    166.10x = 18,623.96
  5. Step 5: Solve for x
    x = 18,623.96/166.10
  6. Step 6: Final answer
    x = 112.13

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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.