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Finding the Third Proportional to 13,680 and 15,624

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Solution

The third proportional to 13,680 and 15,624 is: 17,844.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,680 : 15,624 = 15,624 : x
  2. Step 2: Convert to fraction form
    13,680/15,624 = 15,624/x
  3. Step 3: Cross multiply
    13,680x = 15,624 × 15,624
  4. Step 4: Simplify right side
    13,680x = 244,109,376
  5. Step 5: Solve for x
    x = 244,109,376/13,680
  6. Step 6: Final answer
    x = 17,844.25

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Why These Related Problems?

These problems maintain the same ratio (1.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.