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Finding the Third Proportional to 21,789 and 43,233.75

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Solution

The third proportional to 21,789 and 43,233.75 is: 85,784.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,789 : 43,233.75 = 43,233.75 : x
  2. Step 2: Convert to fraction form
    21,789/43,233.75 = 43,233.75/x
  3. Step 3: Cross multiply
    21,789x = 43,233.75 × 43,233.75
  4. Step 4: Simplify right side
    21,789x = 1,869,157,139.06
  5. Step 5: Solve for x
    x = 1,869,157,139.06/21,789
  6. Step 6: Final answer
    x = 85,784.44

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Why These Related Problems?

These problems maintain the same ratio (1.98) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.