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Finding the Fourth Proportional to 48.40, 66.72 and 39.08

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Solution

The fourth proportional to 48.40, 66.72 and 39.08 is: 53.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.40 : 66.72 = 39.08 : x
  2. Step 2: Convert to fraction form
    48.40/66.72 = 39.08/x
  3. Step 3: Cross multiply
    48.40x = 66.72 × 39.08
  4. Step 4: Simplify right side
    48.40x = 2,607.73
  5. Step 5: Solve for x
    x = 2,607.73/48.40
  6. Step 6: Final answer
    x = 53.88

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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.