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Finding the Fourth Proportional to 42.67, 63.78 and 38.81

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Solution

The fourth proportional to 42.67, 63.78 and 38.81 is: 58.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.67 : 63.78 = 38.81 : x
  2. Step 2: Convert to fraction form
    42.67/63.78 = 38.81/x
  3. Step 3: Cross multiply
    42.67x = 63.78 × 38.81
  4. Step 4: Simplify right side
    42.67x = 2,475.30
  5. Step 5: Solve for x
    x = 2,475.30/42.67
  6. Step 6: Final answer
    x = 58.01

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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.