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Finding the Fourth Proportional to 7,990.92, 11,971.98 and 4,289.22

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Solution

The fourth proportional to 7,990.92, 11,971.98 and 4,289.22 is: 6,426.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,990.92 : 11,971.98 = 4,289.22 : x
  2. Step 2: Convert to fraction form
    7,990.92/11,971.98 = 4,289.22/x
  3. Step 3: Cross multiply
    7,990.92x = 11,971.98 × 4,289.22
  4. Step 4: Simplify right side
    7,990.92x = 51,350,456.06
  5. Step 5: Solve for x
    x = 51,350,456.06/7,990.92
  6. Step 6: Final answer
    x = 6,426.10

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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.