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Finding the Fourth Proportional to 49.18, 67.86 and 31.68

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Solution

The fourth proportional to 49.18, 67.86 and 31.68 is: 43.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.18 : 67.86 = 31.68 : x
  2. Step 2: Convert to fraction form
    49.18/67.86 = 31.68/x
  3. Step 3: Cross multiply
    49.18x = 67.86 × 31.68
  4. Step 4: Simplify right side
    49.18x = 2,149.80
  5. Step 5: Solve for x
    x = 2,149.80/49.18
  6. Step 6: Final answer
    x = 43.71

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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.