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Finding the Fourth Proportional to 69.28, 95.65 and 61.99

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Solution

The fourth proportional to 69.28, 95.65 and 61.99 is: 85.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.28 : 95.65 = 61.99 : x
  2. Step 2: Convert to fraction form
    69.28/95.65 = 61.99/x
  3. Step 3: Cross multiply
    69.28x = 95.65 × 61.99
  4. Step 4: Simplify right side
    69.28x = 5,928.95
  5. Step 5: Solve for x
    x = 5,928.95/69.28
  6. Step 6: Final answer
    x = 85.58

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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.