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Finding the Fourth Proportional to 8,660.39, 12,991.86 and 2,815.56

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Solution

The fourth proportional to 8,660.39, 12,991.86 and 2,815.56 is: 4,223.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,660.39 : 12,991.86 = 2,815.56 : x
  2. Step 2: Convert to fraction form
    8,660.39/12,991.86 = 2,815.56/x
  3. Step 3: Cross multiply
    8,660.39x = 12,991.86 × 2,815.56
  4. Step 4: Simplify right side
    8,660.39x = 36,579,361.34
  5. Step 5: Solve for x
    x = 36,579,361.34/8,660.39
  6. Step 6: Final answer
    x = 4,223.76

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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.