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Finding the Fourth Proportional to 69.36, 95.71 and 39.85

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Solution

The fourth proportional to 69.36, 95.71 and 39.85 is: 54.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.36 : 95.71 = 39.85 : x
  2. Step 2: Convert to fraction form
    69.36/95.71 = 39.85/x
  3. Step 3: Cross multiply
    69.36x = 95.71 × 39.85
  4. Step 4: Simplify right side
    69.36x = 3,814.20
  5. Step 5: Solve for x
    x = 3,814.20/69.36
  6. Step 6: Final answer
    x = 54.99

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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.