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Finding the Third Proportional to 18,721.13 and 21,880.13

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Solution

The third proportional to 18,721.13 and 21,880.13 is: 25,572.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,721.13 : 21,880.13 = 21,880.13 : x
  2. Step 2: Convert to fraction form
    18,721.13/21,880.13 = 21,880.13/x
  3. Step 3: Cross multiply
    18,721.13x = 21,880.13 × 21,880.13
  4. Step 4: Simplify right side
    18,721.13x = 478,739,870.02
  5. Step 5: Solve for x
    x = 478,739,870.02/18,721.13
  6. Step 6: Final answer
    x = 25,572.17

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Why These Related Problems?

These problems maintain the same ratio (1.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.