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Finding the Third Proportional to 15,938 and 21,287

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Solution

The third proportional to 15,938 and 21,287 is: 28,431.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,938 : 21,287 = 21,287 : x
  2. Step 2: Convert to fraction form
    15,938/21,287 = 21,287/x
  3. Step 3: Cross multiply
    15,938x = 21,287 × 21,287
  4. Step 4: Simplify right side
    15,938x = 453,136,369
  5. Step 5: Solve for x
    x = 453,136,369/15,938
  6. Step 6: Final answer
    x = 28,431.19

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.