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Finding the Fourth Proportional to 7,990.68, 11,988.36 and 4,097.80

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Solution

The fourth proportional to 7,990.68, 11,988.36 and 4,097.80 is: 6,147.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,990.68 : 11,988.36 = 4,097.80 : x
  2. Step 2: Convert to fraction form
    7,990.68/11,988.36 = 4,097.80/x
  3. Step 3: Cross multiply
    7,990.68x = 11,988.36 × 4,097.80
  4. Step 4: Simplify right side
    7,990.68x = 49,125,901.61
  5. Step 5: Solve for x
    x = 49,125,901.61/7,990.68
  6. Step 6: Final answer
    x = 6,147.90

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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.