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Finding the Third Proportional to 15,480 and 20,640

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Solution

The third proportional to 15,480 and 20,640 is: 27,520

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,480 : 20,640 = 20,640 : x
  2. Step 2: Convert to fraction form
    15,480/20,640 = 20,640/x
  3. Step 3: Cross multiply
    15,480x = 20,640 × 20,640
  4. Step 4: Simplify right side
    15,480x = 426,009,600
  5. Step 5: Solve for x
    x = 426,009,600/15,480
  6. Step 6: Final answer
    x = 27,520

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.