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Finding the Fourth Proportional to 272.45, 408.78 and 99.11

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Solution

The fourth proportional to 272.45, 408.78 and 99.11 is: 148.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.45 : 408.78 = 99.11 : x
  2. Step 2: Convert to fraction form
    272.45/408.78 = 99.11/x
  3. Step 3: Cross multiply
    272.45x = 408.78 × 99.11
  4. Step 4: Simplify right side
    272.45x = 40,512.14
  5. Step 5: Solve for x
    x = 40,512.14/272.45
  6. Step 6: Final answer
    x = 148.70

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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.