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Finding the Fourth Proportional to 272.30, 408.45 and 89.65

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Solution

The fourth proportional to 272.30, 408.45 and 89.65 is: 134.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.30 : 408.45 = 89.65 : x
  2. Step 2: Convert to fraction form
    272.30/408.45 = 89.65/x
  3. Step 3: Cross multiply
    272.30x = 408.45 × 89.65
  4. Step 4: Simplify right side
    272.30x = 36,617.54
  5. Step 5: Solve for x
    x = 36,617.54/272.30
  6. Step 6: Final answer
    x = 134.48

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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.