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Finding the Fourth Proportional to 15,781.97, 21,759.77 and 12,786.77

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Solution

The fourth proportional to 15,781.97, 21,759.77 and 12,786.77 is: 17,630.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,781.97 : 21,759.77 = 12,786.77 : x
  2. Step 2: Convert to fraction form
    15,781.97/21,759.77 = 12,786.77/x
  3. Step 3: Cross multiply
    15,781.97x = 21,759.77 × 12,786.77
  4. Step 4: Simplify right side
    15,781.97x = 278,237,110.31
  5. Step 5: Solve for x
    x = 278,237,110.31/15,781.97
  6. Step 6: Final answer
    x = 17,630.06

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.