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Finding the Third Proportional to 15,321 and 16,415

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Solution

The third proportional to 15,321 and 16,415 is: 17,587.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,321 : 16,415 = 16,415 : x
  2. Step 2: Convert to fraction form
    15,321/16,415 = 16,415/x
  3. Step 3: Cross multiply
    15,321x = 16,415 × 16,415
  4. Step 4: Simplify right side
    15,321x = 269,452,225
  5. Step 5: Solve for x
    x = 269,452,225/15,321
  6. Step 6: Final answer
    x = 17,587.12

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Why These Related Problems?

These problems maintain the same ratio (1.07) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.