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Finding the Fourth Proportional to 272.31, 408.41 and 89.65

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Solution

The fourth proportional to 272.31, 408.41 and 89.65 is: 134.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.31 : 408.41 = 89.65 : x
  2. Step 2: Convert to fraction form
    272.31/408.41 = 89.65/x
  3. Step 3: Cross multiply
    272.31x = 408.41 × 89.65
  4. Step 4: Simplify right side
    272.31x = 36,613.96
  5. Step 5: Solve for x
    x = 36,613.96/272.31
  6. Step 6: Final answer
    x = 134.46

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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.