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Finding the Fourth Proportional to 69.65, 95.60 and 63.47

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Solution

The fourth proportional to 69.65, 95.60 and 63.47 is: 87.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.65 : 95.60 = 63.47 : x
  2. Step 2: Convert to fraction form
    69.65/95.60 = 63.47/x
  3. Step 3: Cross multiply
    69.65x = 95.60 × 63.47
  4. Step 4: Simplify right side
    69.65x = 6,067.73
  5. Step 5: Solve for x
    x = 6,067.73/69.65
  6. Step 6: Final answer
    x = 87.12

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.