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Finding the Fourth Proportional to 8,687.52, 11,981.52 and 7,112.88

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Solution

The fourth proportional to 8,687.52, 11,981.52 and 7,112.88 is: 9,809.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,687.52 : 11,981.52 = 7,112.88 : x
  2. Step 2: Convert to fraction form
    8,687.52/11,981.52 = 7,112.88/x
  3. Step 3: Cross multiply
    8,687.52x = 11,981.52 × 7,112.88
  4. Step 4: Simplify right side
    8,687.52x = 85,223,113.98
  5. Step 5: Solve for x
    x = 85,223,113.98/8,687.52
  6. Step 6: Final answer
    x = 9,809.83

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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.