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Finding the Fourth Proportional to 49.59, 68.37 and 39.80

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Solution

The fourth proportional to 49.59, 68.37 and 39.80 is: 54.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.59 : 68.37 = 39.80 : x
  2. Step 2: Convert to fraction form
    49.59/68.37 = 39.80/x
  3. Step 3: Cross multiply
    49.59x = 68.37 × 39.80
  4. Step 4: Simplify right side
    49.59x = 2,720.78
  5. Step 5: Solve for x
    x = 2,720.78/49.59
  6. Step 6: Final answer
    x = 54.87

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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.