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Finding the Fourth Proportional to 8,169.80, 12,162.31 and 8,121.20

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Solution

The fourth proportional to 8,169.80, 12,162.31 and 8,121.20 is: 12,089.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,169.80 : 12,162.31 = 8,121.20 : x
  2. Step 2: Convert to fraction form
    8,169.80/12,162.31 = 8,121.20/x
  3. Step 3: Cross multiply
    8,169.80x = 12,162.31 × 8,121.20
  4. Step 4: Simplify right side
    8,169.80x = 98,772,551.97
  5. Step 5: Solve for x
    x = 98,772,551.97/8,169.80
  6. Step 6: Final answer
    x = 12,089.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.