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Finding the Fourth Proportional to 48.39, 72.48 and 39.87

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Solution

The fourth proportional to 48.39, 72.48 and 39.87 is: 59.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.39 : 72.48 = 39.87 : x
  2. Step 2: Convert to fraction form
    48.39/72.48 = 39.87/x
  3. Step 3: Cross multiply
    48.39x = 72.48 × 39.87
  4. Step 4: Simplify right side
    48.39x = 2,889.78
  5. Step 5: Solve for x
    x = 2,889.78/48.39
  6. Step 6: Final answer
    x = 59.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.