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Finding the Fourth Proportional to 48.92, 67.42 and 39.72

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Solution

The fourth proportional to 48.92, 67.42 and 39.72 is: 54.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.92 : 67.42 = 39.72 : x
  2. Step 2: Convert to fraction form
    48.92/67.42 = 39.72/x
  3. Step 3: Cross multiply
    48.92x = 67.42 × 39.72
  4. Step 4: Simplify right side
    48.92x = 2,677.92
  5. Step 5: Solve for x
    x = 2,677.92/48.92
  6. Step 6: Final answer
    x = 54.74

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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.