Home / 20,471.11-30,705.27-7,988.80

Finding the Fourth Proportional to 20,471.11, 30,705.27 and 7,988.80

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Solution

The fourth proportional to 20,471.11, 30,705.27 and 7,988.80 is: 11,982.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,471.11 : 30,705.27 = 7,988.80 : x
  2. Step 2: Convert to fraction form
    20,471.11/30,705.27 = 7,988.80/x
  3. Step 3: Cross multiply
    20,471.11x = 30,705.27 × 7,988.80
  4. Step 4: Simplify right side
    20,471.11x = 245,298,260.98
  5. Step 5: Solve for x
    x = 245,298,260.98/20,471.11
  6. Step 6: Final answer
    x = 11,982.66

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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.