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Finding the Fourth Proportional to 40.13, 60.21 and 19.85

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Solution

The fourth proportional to 40.13, 60.21 and 19.85 is: 29.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.13 : 60.21 = 19.85 : x
  2. Step 2: Convert to fraction form
    40.13/60.21 = 19.85/x
  3. Step 3: Cross multiply
    40.13x = 60.21 × 19.85
  4. Step 4: Simplify right side
    40.13x = 1,194.87
  5. Step 5: Solve for x
    x = 1,194.87/40.13
  6. Step 6: Final answer
    x = 29.78

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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.