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Finding the Fourth Proportional to 8,687.80, 11,990.46 and 7,269.40

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Solution

The fourth proportional to 8,687.80, 11,990.46 and 7,269.40 is: 10,032.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,687.80 : 11,990.46 = 7,269.40 : x
  2. Step 2: Convert to fraction form
    8,687.80/11,990.46 = 7,269.40/x
  3. Step 3: Cross multiply
    8,687.80x = 11,990.46 × 7,269.40
  4. Step 4: Simplify right side
    8,687.80x = 87,163,449.92
  5. Step 5: Solve for x
    x = 87,163,449.92/8,687.80
  6. Step 6: Final answer
    x = 10,032.86

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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.