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Finding the Fourth Proportional to 8,111.75, 12,167.64 and 2,639.75

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Solution

The fourth proportional to 8,111.75, 12,167.64 and 2,639.75 is: 3,959.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,111.75 : 12,167.64 = 2,639.75 : x
  2. Step 2: Convert to fraction form
    8,111.75/12,167.64 = 2,639.75/x
  3. Step 3: Cross multiply
    8,111.75x = 12,167.64 × 2,639.75
  4. Step 4: Simplify right side
    8,111.75x = 32,119,527.69
  5. Step 5: Solve for x
    x = 32,119,527.69/8,111.75
  6. Step 6: Final answer
    x = 3,959.63

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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.