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Finding the Fourth Proportional to 42.13, 62.81 and 40.45

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Solution

The fourth proportional to 42.13, 62.81 and 40.45 is: 60.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.13 : 62.81 = 40.45 : x
  2. Step 2: Convert to fraction form
    42.13/62.81 = 40.45/x
  3. Step 3: Cross multiply
    42.13x = 62.81 × 40.45
  4. Step 4: Simplify right side
    42.13x = 2,540.66
  5. Step 5: Solve for x
    x = 2,540.66/42.13
  6. Step 6: Final answer
    x = 60.31

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.