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Finding the Fourth Proportional to 272.12, 408.24 and 79.76

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Solution

The fourth proportional to 272.12, 408.24 and 79.76 is: 119.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.12 : 408.24 = 79.76 : x
  2. Step 2: Convert to fraction form
    272.12/408.24 = 79.76/x
  3. Step 3: Cross multiply
    272.12x = 408.24 × 79.76
  4. Step 4: Simplify right side
    272.12x = 32,561.22
  5. Step 5: Solve for x
    x = 32,561.22/272.12
  6. Step 6: Final answer
    x = 119.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.