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Finding the Fourth Proportional to 272.38, 408.56 and 99

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Solution

The fourth proportional to 272.38, 408.56 and 99 is: 148.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.38 : 408.56 = 99 : x
  2. Step 2: Convert to fraction form
    272.38/408.56 = 99/x
  3. Step 3: Cross multiply
    272.38x = 408.56 × 99
  4. Step 4: Simplify right side
    272.38x = 40,447.44
  5. Step 5: Solve for x
    x = 40,447.44/272.38
  6. Step 6: Final answer
    x = 148.50

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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.