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Finding the Fourth Proportional to 40.18, 60.22 and 19.90

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Solution

The fourth proportional to 40.18, 60.22 and 19.90 is: 29.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.18 : 60.22 = 19.90 : x
  2. Step 2: Convert to fraction form
    40.18/60.22 = 19.90/x
  3. Step 3: Cross multiply
    40.18x = 60.22 × 19.90
  4. Step 4: Simplify right side
    40.18x = 1,198.23
  5. Step 5: Solve for x
    x = 1,198.23/40.18
  6. Step 6: Final answer
    x = 29.83

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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.