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Finding the Fourth Proportional to 48.87, 67.50 and 39.69

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Solution

The fourth proportional to 48.87, 67.50 and 39.69 is: 54.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.87 : 67.50 = 39.69 : x
  2. Step 2: Convert to fraction form
    48.87/67.50 = 39.69/x
  3. Step 3: Cross multiply
    48.87x = 67.50 × 39.69
  4. Step 4: Simplify right side
    48.87x = 2,679.08
  5. Step 5: Solve for x
    x = 2,679.08/48.87
  6. Step 6: Final answer
    x = 54.82

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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.