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Finding the Fourth Proportional to 69.82, 96.40 and 60.72

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Solution

The fourth proportional to 69.82, 96.40 and 60.72 is: 83.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    69.82 : 96.40 = 60.72 : x
  2. Step 2: Convert to fraction form
    69.82/96.40 = 60.72/x
  3. Step 3: Cross multiply
    69.82x = 96.40 × 60.72
  4. Step 4: Simplify right side
    69.82x = 5,853.41
  5. Step 5: Solve for x
    x = 5,853.41/69.82
  6. Step 6: Final answer
    x = 83.84

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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.