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Finding the Fourth Proportional to 69.74, 104.49 and 53.48

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Solution

The fourth proportional to 69.74, 104.49 and 53.48 is: 80.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.74 : 104.49 = 53.48 : x
  2. Step 2: Convert to fraction form
    69.74/104.49 = 53.48/x
  3. Step 3: Cross multiply
    69.74x = 104.49 × 53.48
  4. Step 4: Simplify right side
    69.74x = 5,587.60
  5. Step 5: Solve for x
    x = 5,587.60/69.74
  6. Step 6: Final answer
    x = 80.12

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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.