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Finding the Fourth Proportional to 8,659.55, 12,989.33 and 2,085.73

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Solution

The fourth proportional to 8,659.55, 12,989.33 and 2,085.73 is: 3,128.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,659.55 : 12,989.33 = 2,085.73 : x
  2. Step 2: Convert to fraction form
    8,659.55/12,989.33 = 2,085.73/x
  3. Step 3: Cross multiply
    8,659.55x = 12,989.33 × 2,085.73
  4. Step 4: Simplify right side
    8,659.55x = 27,092,241.07
  5. Step 5: Solve for x
    x = 27,092,241.07/8,659.55
  6. Step 6: Final answer
    x = 3,128.60

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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.