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Finding the Fourth Proportional to 8,659.60, 12,981.42 and 2,813.20

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Solution

The fourth proportional to 8,659.60, 12,981.42 and 2,813.20 is: 4,217.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,659.60 : 12,981.42 = 2,813.20 : x
  2. Step 2: Convert to fraction form
    8,659.60/12,981.42 = 2,813.20/x
  3. Step 3: Cross multiply
    8,659.60x = 12,981.42 × 2,813.20
  4. Step 4: Simplify right side
    8,659.60x = 36,519,330.74
  5. Step 5: Solve for x
    x = 36,519,330.74/8,659.60
  6. Step 6: Final answer
    x = 4,217.21

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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.