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Finding the Fourth Proportional to 8,625.90, 12,940.20 and 2,781.75

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Solution

The fourth proportional to 8,625.90, 12,940.20 and 2,781.75 is: 4,173.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,625.90 : 12,940.20 = 2,781.75 : x
  2. Step 2: Convert to fraction form
    8,625.90/12,940.20 = 2,781.75/x
  3. Step 3: Cross multiply
    8,625.90x = 12,940.20 × 2,781.75
  4. Step 4: Simplify right side
    8,625.90x = 35,996,401.35
  5. Step 5: Solve for x
    x = 35,996,401.35/8,625.90
  6. Step 6: Final answer
    x = 4,173.06

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.