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Finding the Third Proportional to 15,123.75 and 21,387

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Solution

The third proportional to 15,123.75 and 21,387 is: 30,244.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,123.75 : 21,387 = 21,387 : x
  2. Step 2: Convert to fraction form
    15,123.75/21,387 = 21,387/x
  3. Step 3: Cross multiply
    15,123.75x = 21,387 × 21,387
  4. Step 4: Simplify right side
    15,123.75x = 457,403,769
  5. Step 5: Solve for x
    x = 457,403,769/15,123.75
  6. Step 6: Final answer
    x = 30,244.07

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.