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Finding the Fourth Proportional to 7,990.80, 11,986.20 and 4,102.80

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Solution

The fourth proportional to 7,990.80, 11,986.20 and 4,102.80 is: 6,154.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,990.80 : 11,986.20 = 4,102.80 : x
  2. Step 2: Convert to fraction form
    7,990.80/11,986.20 = 4,102.80/x
  3. Step 3: Cross multiply
    7,990.80x = 11,986.20 × 4,102.80
  4. Step 4: Simplify right side
    7,990.80x = 49,176,981.36
  5. Step 5: Solve for x
    x = 49,176,981.36/7,990.80
  6. Step 6: Final answer
    x = 6,154.20

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.