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Finding the Fourth Proportional to 147.10, 220.17 and 82.78

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Solution

The fourth proportional to 147.10, 220.17 and 82.78 is: 123.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.10 : 220.17 = 82.78 : x
  2. Step 2: Convert to fraction form
    147.10/220.17 = 82.78/x
  3. Step 3: Cross multiply
    147.10x = 220.17 × 82.78
  4. Step 4: Simplify right side
    147.10x = 18,225.67
  5. Step 5: Solve for x
    x = 18,225.67/147.10
  6. Step 6: Final answer
    x = 123.90

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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.