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Finding the Third Proportional to 21,280 and 45,718

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Solution

The third proportional to 21,280 and 45,718 is: 98,220.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,280 : 45,718 = 45,718 : x
  2. Step 2: Convert to fraction form
    21,280/45,718 = 45,718/x
  3. Step 3: Cross multiply
    21,280x = 45,718 × 45,718
  4. Step 4: Simplify right side
    21,280x = 2,090,135,524
  5. Step 5: Solve for x
    x = 2,090,135,524/21,280
  6. Step 6: Final answer
    x = 98,220.65

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.