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Finding the Third Proportional to 15,781.50 and 18,661.50

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Solution

The third proportional to 15,781.50 and 18,661.50 is: 22,067.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,781.50 : 18,661.50 = 18,661.50 : x
  2. Step 2: Convert to fraction form
    15,781.50/18,661.50 = 18,661.50/x
  3. Step 3: Cross multiply
    15,781.50x = 18,661.50 × 18,661.50
  4. Step 4: Simplify right side
    15,781.50x = 348,251,582.25
  5. Step 5: Solve for x
    x = 348,251,582.25/15,781.50
  6. Step 6: Final answer
    x = 22,067.08

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Why These Related Problems?

These problems maintain the same ratio (1.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.