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Finding the Fourth Proportional to 67.27, 100.78 and 38.35

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Solution

The fourth proportional to 67.27, 100.78 and 38.35 is: 57.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.27 : 100.78 = 38.35 : x
  2. Step 2: Convert to fraction form
    67.27/100.78 = 38.35/x
  3. Step 3: Cross multiply
    67.27x = 100.78 × 38.35
  4. Step 4: Simplify right side
    67.27x = 3,864.57
  5. Step 5: Solve for x
    x = 3,864.57/67.27
  6. Step 6: Final answer
    x = 57.45

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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.