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Finding the Fourth Proportional to 69.61, 104.42 and 21.52

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Solution

The fourth proportional to 69.61, 104.42 and 21.52 is: 32.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.61 : 104.42 = 21.52 : x
  2. Step 2: Convert to fraction form
    69.61/104.42 = 21.52/x
  3. Step 3: Cross multiply
    69.61x = 104.42 × 21.52
  4. Step 4: Simplify right side
    69.61x = 2,246.72
  5. Step 5: Solve for x
    x = 2,246.72/69.61
  6. Step 6: Final answer
    x = 32.28

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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.