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Finding the Fourth Proportional to 272.31, 408.48 and 79.94

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Solution

The fourth proportional to 272.31, 408.48 and 79.94 is: 119.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.31 : 408.48 = 79.94 : x
  2. Step 2: Convert to fraction form
    272.31/408.48 = 79.94/x
  3. Step 3: Cross multiply
    272.31x = 408.48 × 79.94
  4. Step 4: Simplify right side
    272.31x = 32,653.89
  5. Step 5: Solve for x
    x = 32,653.89/272.31
  6. Step 6: Final answer
    x = 119.91

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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.