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Finding the Fourth Proportional to 8,781.74, 12,126.89 and 5,643.40

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Solution

The fourth proportional to 8,781.74, 12,126.89 and 5,643.40 is: 7,793.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,781.74 : 12,126.89 = 5,643.40 : x
  2. Step 2: Convert to fraction form
    8,781.74/12,126.89 = 5,643.40/x
  3. Step 3: Cross multiply
    8,781.74x = 12,126.89 × 5,643.40
  4. Step 4: Simplify right side
    8,781.74x = 68,436,891.03
  5. Step 5: Solve for x
    x = 68,436,891.03/8,781.74
  6. Step 6: Final answer
    x = 7,793.09

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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.