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Finding the Fourth Proportional to 69.64, 95.95 and 57.92

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Solution

The fourth proportional to 69.64, 95.95 and 57.92 is: 79.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.64 : 95.95 = 57.92 : x
  2. Step 2: Convert to fraction form
    69.64/95.95 = 57.92/x
  3. Step 3: Cross multiply
    69.64x = 95.95 × 57.92
  4. Step 4: Simplify right side
    69.64x = 5,556.80
  5. Step 5: Solve for x
    x = 5,556.80/69.64
  6. Step 6: Final answer
    x = 79.80

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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.