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Finding the Fourth Proportional to 48.17, 72.16 and 31.87

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Solution

The fourth proportional to 48.17, 72.16 and 31.87 is: 47.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.17 : 72.16 = 31.87 : x
  2. Step 2: Convert to fraction form
    48.17/72.16 = 31.87/x
  3. Step 3: Cross multiply
    48.17x = 72.16 × 31.87
  4. Step 4: Simplify right side
    48.17x = 2,299.87
  5. Step 5: Solve for x
    x = 2,299.87/48.17
  6. Step 6: Final answer
    x = 47.74

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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.