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Finding the Fourth Proportional to 69.36, 95.67 and 57.15

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Solution

The fourth proportional to 69.36, 95.67 and 57.15 is: 78.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.36 : 95.67 = 57.15 : x
  2. Step 2: Convert to fraction form
    69.36/95.67 = 57.15/x
  3. Step 3: Cross multiply
    69.36x = 95.67 × 57.15
  4. Step 4: Simplify right side
    69.36x = 5,467.54
  5. Step 5: Solve for x
    x = 5,467.54/69.36
  6. Step 6: Final answer
    x = 78.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.