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Finding the Fourth Proportional to 48.80, 67.31 and 38.95

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Solution

The fourth proportional to 48.80, 67.31 and 38.95 is: 53.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.80 : 67.31 = 38.95 : x
  2. Step 2: Convert to fraction form
    48.80/67.31 = 38.95/x
  3. Step 3: Cross multiply
    48.80x = 67.31 × 38.95
  4. Step 4: Simplify right side
    48.80x = 2,621.72
  5. Step 5: Solve for x
    x = 2,621.72/48.80
  6. Step 6: Final answer
    x = 53.72

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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.