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Finding the Fourth Proportional to 49.13, 67.80 and 31.66

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Solution

The fourth proportional to 49.13, 67.80 and 31.66 is: 43.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.13 : 67.80 = 31.66 : x
  2. Step 2: Convert to fraction form
    49.13/67.80 = 31.66/x
  3. Step 3: Cross multiply
    49.13x = 67.80 × 31.66
  4. Step 4: Simplify right side
    49.13x = 2,146.72
  5. Step 5: Solve for x
    x = 2,146.72/49.13
  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.