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Finding the Fourth Proportional to 272.55, 408.90 and 99.21

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Solution

The fourth proportional to 272.55, 408.90 and 99.21 is: 148.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.55 : 408.90 = 99.21 : x
  2. Step 2: Convert to fraction form
    272.55/408.90 = 99.21/x
  3. Step 3: Cross multiply
    272.55x = 408.90 × 99.21
  4. Step 4: Simplify right side
    272.55x = 40,566.97
  5. Step 5: Solve for x
    x = 40,566.97/272.55
  6. Step 6: Final answer
    x = 148.84

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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.