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Finding the Fourth Proportional to 76.82, 114.65 and 67.26

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Solution

The fourth proportional to 76.82, 114.65 and 67.26 is: 100.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.82 : 114.65 = 67.26 : x
  2. Step 2: Convert to fraction form
    76.82/114.65 = 67.26/x
  3. Step 3: Cross multiply
    76.82x = 114.65 × 67.26
  4. Step 4: Simplify right side
    76.82x = 7,711.70
  5. Step 5: Solve for x
    x = 7,711.70/76.82
  6. Step 6: Final answer
    x = 100.39

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.