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Finding the Fourth Proportional to 272.05, 408.12 and 89.43

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Solution

The fourth proportional to 272.05, 408.12 and 89.43 is: 134.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.05 : 408.12 = 89.43 : x
  2. Step 2: Convert to fraction form
    272.05/408.12 = 89.43/x
  3. Step 3: Cross multiply
    272.05x = 408.12 × 89.43
  4. Step 4: Simplify right side
    272.05x = 36,498.17
  5. Step 5: Solve for x
    x = 36,498.17/272.05
  6. Step 6: Final answer
    x = 134.16

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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.