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Finding the Third Proportional to 13,398 and 20,409

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Solution

The third proportional to 13,398 and 20,409 is: 31,088.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,398 : 20,409 = 20,409 : x
  2. Step 2: Convert to fraction form
    13,398/20,409 = 20,409/x
  3. Step 3: Cross multiply
    13,398x = 20,409 × 20,409
  4. Step 4: Simplify right side
    13,398x = 416,527,281
  5. Step 5: Solve for x
    x = 416,527,281/13,398
  6. Step 6: Final answer
    x = 31,088.77

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.