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Finding the Fourth Proportional to 8,687.95, 12,999.62 and 5,179.86

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Solution

The fourth proportional to 8,687.95, 12,999.62 and 5,179.86 is: 7,750.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,687.95 : 12,999.62 = 5,179.86 : x
  2. Step 2: Convert to fraction form
    8,687.95/12,999.62 = 5,179.86/x
  3. Step 3: Cross multiply
    8,687.95x = 12,999.62 × 5,179.86
  4. Step 4: Simplify right side
    8,687.95x = 67,336,224.60
  5. Step 5: Solve for x
    x = 67,336,224.60/8,687.95
  6. Step 6: Final answer
    x = 7,750.53

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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.