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Finding the Fourth Proportional to 49.17, 67.82 and 31.69

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Solution

The fourth proportional to 49.17, 67.82 and 31.69 is: 43.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.17 : 67.82 = 31.69 : x
  2. Step 2: Convert to fraction form
    49.17/67.82 = 31.69/x
  3. Step 3: Cross multiply
    49.17x = 67.82 × 31.69
  4. Step 4: Simplify right side
    49.17x = 2,148.88
  5. Step 5: Solve for x
    x = 2,148.88/49.17
  6. Step 6: Final answer
    x = 43.70

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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.