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Finding the Fourth Proportional to 41.20, 61.78 and 14.15

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Solution

The fourth proportional to 41.20, 61.78 and 14.15 is: 21.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    41.20 : 61.78 = 14.15 : x
  2. Step 2: Convert to fraction form
    41.20/61.78 = 14.15/x
  3. Step 3: Cross multiply
    41.20x = 61.78 × 14.15
  4. Step 4: Simplify right side
    41.20x = 873.81
  5. Step 5: Solve for x
    x = 873.81/41.20
  6. Step 6: Final answer
    x = 21.21

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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.