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Finding the Fourth Proportional to 67.67, 93.38 and 39.28

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Solution

The fourth proportional to 67.67, 93.38 and 39.28 is: 54.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.67 : 93.38 = 39.28 : x
  2. Step 2: Convert to fraction form
    67.67/93.38 = 39.28/x
  3. Step 3: Cross multiply
    67.67x = 93.38 × 39.28
  4. Step 4: Simplify right side
    67.67x = 3,667.30
  5. Step 5: Solve for x
    x = 3,667.30/67.67
  6. Step 6: Final answer
    x = 54.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.