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Finding the Third Proportional to 191.38 and 420.25

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Solution

The third proportional to 191.38 and 420.25 is: 922.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.38 : 420.25 = 420.25 : x
  2. Step 2: Convert to fraction form
    191.38/420.25 = 420.25/x
  3. Step 3: Cross multiply
    191.38x = 420.25 × 420.25
  4. Step 4: Simplify right side
    191.38x = 176,610.06
  5. Step 5: Solve for x
    x = 176,610.06/191.38
  6. Step 6: Final answer
    x = 922.85

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.