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Finding the Fourth Proportional to 42.48, 63.39 and 40.08

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Solution

The fourth proportional to 42.48, 63.39 and 40.08 is: 59.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.48 : 63.39 = 40.08 : x
  2. Step 2: Convert to fraction form
    42.48/63.39 = 40.08/x
  3. Step 3: Cross multiply
    42.48x = 63.39 × 40.08
  4. Step 4: Simplify right side
    42.48x = 2,540.67
  5. Step 5: Solve for x
    x = 2,540.67/42.48
  6. Step 6: Final answer
    x = 59.81

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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.