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Finding the Third Proportional to 91.20 and 200.11

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Solution

The third proportional to 91.20 and 200.11 is: 439.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.20 : 200.11 = 200.11 : x
  2. Step 2: Convert to fraction form
    91.20/200.11 = 200.11/x
  3. Step 3: Cross multiply
    91.20x = 200.11 × 200.11
  4. Step 4: Simplify right side
    91.20x = 40,043.76
  5. Step 5: Solve for x
    x = 40,043.76/91.20
  6. Step 6: Final answer
    x = 439.10

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.