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Finding the Third Proportional to 18,387 and 39,689.25

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Solution

The third proportional to 18,387 and 39,689.25 is: 85,671.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,387 : 39,689.25 = 39,689.25 : x
  2. Step 2: Convert to fraction form
    18,387/39,689.25 = 39,689.25/x
  3. Step 3: Cross multiply
    18,387x = 39,689.25 × 39,689.25
  4. Step 4: Simplify right side
    18,387x = 1,575,236,565.56
  5. Step 5: Solve for x
    x = 1,575,236,565.56/18,387
  6. Step 6: Final answer
    x = 85,671.21

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.