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Finding the Fourth Proportional to 42.68, 63.68 and 38.84

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Solution

The fourth proportional to 42.68, 63.68 and 38.84 is: 57.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.68 : 63.68 = 38.84 : x
  2. Step 2: Convert to fraction form
    42.68/63.68 = 38.84/x
  3. Step 3: Cross multiply
    42.68x = 63.68 × 38.84
  4. Step 4: Simplify right side
    42.68x = 2,473.59
  5. Step 5: Solve for x
    x = 2,473.59/42.68
  6. Step 6: Final answer
    x = 57.96

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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.