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Finding the Fourth Proportional to 79.21, 119.53 and 76.49

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Solution

The fourth proportional to 79.21, 119.53 and 76.49 is: 115.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.21 : 119.53 = 76.49 : x
  2. Step 2: Convert to fraction form
    79.21/119.53 = 76.49/x
  3. Step 3: Cross multiply
    79.21x = 119.53 × 76.49
  4. Step 4: Simplify right side
    79.21x = 9,143.68
  5. Step 5: Solve for x
    x = 9,143.68/79.21
  6. Step 6: Final answer
    x = 115.43

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.