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Finding the Third Proportional to 10,380 and 15,678

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Solution

The third proportional to 10,380 and 15,678 is: 23,680.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,380 : 15,678 = 15,678 : x
  2. Step 2: Convert to fraction form
    10,380/15,678 = 15,678/x
  3. Step 3: Cross multiply
    10,380x = 15,678 × 15,678
  4. Step 4: Simplify right side
    10,380x = 245,799,684
  5. Step 5: Solve for x
    x = 245,799,684/10,380
  6. Step 6: Final answer
    x = 23,680.12

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.