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Finding the Fourth Proportional to 69.89, 104.32 and 61.88

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Solution

The fourth proportional to 69.89, 104.32 and 61.88 is: 92.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.89 : 104.32 = 61.88 : x
  2. Step 2: Convert to fraction form
    69.89/104.32 = 61.88/x
  3. Step 3: Cross multiply
    69.89x = 104.32 × 61.88
  4. Step 4: Simplify right side
    69.89x = 6,455.32
  5. Step 5: Solve for x
    x = 6,455.32/69.89
  6. Step 6: Final answer
    x = 92.36

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.