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Finding the Fourth Proportional to 147.11, 220.67 and 38.90

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Solution

The fourth proportional to 147.11, 220.67 and 38.90 is: 58.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.11 : 220.67 = 38.90 : x
  2. Step 2: Convert to fraction form
    147.11/220.67 = 38.90/x
  3. Step 3: Cross multiply
    147.11x = 220.67 × 38.90
  4. Step 4: Simplify right side
    147.11x = 8,582.77
  5. Step 5: Solve for x
    x = 8,582.77/147.11
  6. Step 6: Final answer
    x = 58.34

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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.