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Finding the Fourth Proportional to 272.45, 408.61 and 99.12

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Solution

The fourth proportional to 272.45, 408.61 and 99.12 is: 148.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.45 : 408.61 = 99.12 : x
  2. Step 2: Convert to fraction form
    272.45/408.61 = 99.12/x
  3. Step 3: Cross multiply
    272.45x = 408.61 × 99.12
  4. Step 4: Simplify right side
    272.45x = 40,500.78
  5. Step 5: Solve for x
    x = 40,500.78/272.45
  6. Step 6: Final answer
    x = 148.66

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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.