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Finding the Fourth Proportional to 69.75, 96.15 and 61.52

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Solution

The fourth proportional to 69.75, 96.15 and 61.52 is: 84.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.75 : 96.15 = 61.52 : x
  2. Step 2: Convert to fraction form
    69.75/96.15 = 61.52/x
  3. Step 3: Cross multiply
    69.75x = 96.15 × 61.52
  4. Step 4: Simplify right side
    69.75x = 5,914.90
  5. Step 5: Solve for x
    x = 5,914.90/69.75
  6. Step 6: Final answer
    x = 84.80

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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.