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Finding the Fourth Proportional to 8,659.89, 12,990.74 and 2,815.13

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Solution

The fourth proportional to 8,659.89, 12,990.74 and 2,815.13 is: 4,222.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,659.89 : 12,990.74 = 2,815.13 : x
  2. Step 2: Convert to fraction form
    8,659.89/12,990.74 = 2,815.13/x
  3. Step 3: Cross multiply
    8,659.89x = 12,990.74 × 2,815.13
  4. Step 4: Simplify right side
    8,659.89x = 36,570,621.90
  5. Step 5: Solve for x
    x = 36,570,621.90/8,659.89
  6. Step 6: Final answer
    x = 4,222.99

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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.