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Finding the Fourth Proportional to 40.13, 60.11 and 20.86

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Solution

The fourth proportional to 40.13, 60.11 and 20.86 is: 31.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.13 : 60.11 = 20.86 : x
  2. Step 2: Convert to fraction form
    40.13/60.11 = 20.86/x
  3. Step 3: Cross multiply
    40.13x = 60.11 × 20.86
  4. Step 4: Simplify right side
    40.13x = 1,253.89
  5. Step 5: Solve for x
    x = 1,253.89/40.13
  6. Step 6: Final answer
    x = 31.25

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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.