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Finding the Fourth Proportional to 76.14, 104.80 and 66.42

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Solution

The fourth proportional to 76.14, 104.80 and 66.42 is: 91.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.14 : 104.80 = 66.42 : x
  2. Step 2: Convert to fraction form
    76.14/104.80 = 66.42/x
  3. Step 3: Cross multiply
    76.14x = 104.80 × 66.42
  4. Step 4: Simplify right side
    76.14x = 6,960.29
  5. Step 5: Solve for x
    x = 6,960.29/76.14
  6. Step 6: Final answer
    x = 91.42

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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.