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Finding the Fourth Proportional to 8,813.64, 12,138.76 and 8,179.44

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Solution

The fourth proportional to 8,813.64, 12,138.76 and 8,179.44 is: 11,265.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,813.64 : 12,138.76 = 8,179.44 : x
  2. Step 2: Convert to fraction form
    8,813.64/12,138.76 = 8,179.44/x
  3. Step 3: Cross multiply
    8,813.64x = 12,138.76 × 8,179.44
  4. Step 4: Simplify right side
    8,813.64x = 99,288,259.09
  5. Step 5: Solve for x
    x = 99,288,259.09/8,813.64
  6. Step 6: Final answer
    x = 11,265.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.