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Finding the Fourth Proportional to 67.64, 101.42 and 38.78

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Solution

The fourth proportional to 67.64, 101.42 and 38.78 is: 58.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.64 : 101.42 = 38.78 : x
  2. Step 2: Convert to fraction form
    67.64/101.42 = 38.78/x
  3. Step 3: Cross multiply
    67.64x = 101.42 × 38.78
  4. Step 4: Simplify right side
    67.64x = 3,933.07
  5. Step 5: Solve for x
    x = 3,933.07/67.64
  6. Step 6: Final answer
    x = 58.15

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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.