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Finding the Fourth Proportional to 18,781.85, 25,936.52 and 12,079.12

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Solution

The fourth proportional to 18,781.85, 25,936.52 and 12,079.12 is: 16,680.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,781.85 : 25,936.52 = 12,079.12 : x
  2. Step 2: Convert to fraction form
    18,781.85/25,936.52 = 12,079.12/x
  3. Step 3: Cross multiply
    18,781.85x = 25,936.52 × 12,079.12
  4. Step 4: Simplify right side
    18,781.85x = 313,290,212.23
  5. Step 5: Solve for x
    x = 313,290,212.23/18,781.85
  6. Step 6: Final answer
    x = 16,680.47

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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.