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Finding the Fourth Proportional to 48.75, 67.17 and 39.98

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Solution

The fourth proportional to 48.75, 67.17 and 39.98 is: 55.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.75 : 67.17 = 39.98 : x
  2. Step 2: Convert to fraction form
    48.75/67.17 = 39.98/x
  3. Step 3: Cross multiply
    48.75x = 67.17 × 39.98
  4. Step 4: Simplify right side
    48.75x = 2,685.59
  5. Step 5: Solve for x
    x = 2,685.59/48.75
  6. Step 6: Final answer
    x = 55.09

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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.