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Finding the Fourth Proportional to 8,659.80, 12,991.06 and 2,815.04

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Solution

The fourth proportional to 8,659.80, 12,991.06 and 2,815.04 is: 4,223.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,659.80 : 12,991.06 = 2,815.04 : x
  2. Step 2: Convert to fraction form
    8,659.80/12,991.06 = 2,815.04/x
  3. Step 3: Cross multiply
    8,659.80x = 12,991.06 × 2,815.04
  4. Step 4: Simplify right side
    8,659.80x = 36,570,389.54
  5. Step 5: Solve for x
    x = 36,570,389.54/8,659.80
  6. Step 6: Final answer
    x = 4,223.01

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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.