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Finding the Fourth Proportional to 149.10, 223.17 and 84.78

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Solution

The fourth proportional to 149.10, 223.17 and 84.78 is: 126.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.10 : 223.17 = 84.78 : x
  2. Step 2: Convert to fraction form
    149.10/223.17 = 84.78/x
  3. Step 3: Cross multiply
    149.10x = 223.17 × 84.78
  4. Step 4: Simplify right side
    149.10x = 18,920.35
  5. Step 5: Solve for x
    x = 18,920.35/149.10
  6. Step 6: Final answer
    x = 126.90

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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.