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Finding the Fourth Proportional to 8,672.88, 11,969.52 and 5,691.12

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Solution

The fourth proportional to 8,672.88, 11,969.52 and 5,691.12 is: 7,854.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,672.88 : 11,969.52 = 5,691.12 : x
  2. Step 2: Convert to fraction form
    8,672.88/11,969.52 = 5,691.12/x
  3. Step 3: Cross multiply
    8,672.88x = 11,969.52 × 5,691.12
  4. Step 4: Simplify right side
    8,672.88x = 68,119,974.66
  5. Step 5: Solve for x
    x = 68,119,974.66/8,672.88
  6. Step 6: Final answer
    x = 7,854.37

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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.