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Finding the Fourth Proportional to 53.98, 80.74 and 38.69

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Solution

The fourth proportional to 53.98, 80.74 and 38.69 is: 57.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.98 : 80.74 = 38.69 : x
  2. Step 2: Convert to fraction form
    53.98/80.74 = 38.69/x
  3. Step 3: Cross multiply
    53.98x = 80.74 × 38.69
  4. Step 4: Simplify right side
    53.98x = 3,123.83
  5. Step 5: Solve for x
    x = 3,123.83/53.98
  6. Step 6: Final answer
    x = 57.87

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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.