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Finding the Fourth Proportional to 69.72, 104.34 and 61.72

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Solution

The fourth proportional to 69.72, 104.34 and 61.72 is: 92.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.72 : 104.34 = 61.72 : x
  2. Step 2: Convert to fraction form
    69.72/104.34 = 61.72/x
  3. Step 3: Cross multiply
    69.72x = 104.34 × 61.72
  4. Step 4: Simplify right side
    69.72x = 6,439.86
  5. Step 5: Solve for x
    x = 6,439.86/69.72
  6. Step 6: Final answer
    x = 92.37

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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.