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Finding the Fourth Proportional to 41.10, 61.68 and 21.90

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Solution

The fourth proportional to 41.10, 61.68 and 21.90 is: 32.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    41.10 : 61.68 = 21.90 : x
  2. Step 2: Convert to fraction form
    41.10/61.68 = 21.90/x
  3. Step 3: Cross multiply
    41.10x = 61.68 × 21.90
  4. Step 4: Simplify right side
    41.10x = 1,350.79
  5. Step 5: Solve for x
    x = 1,350.79/41.10
  6. Step 6: Final answer
    x = 32.87

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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.