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Finding the Fourth Proportional to 20,660.97, 30,990.74 and 8,974.19

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Solution

The fourth proportional to 20,660.97, 30,990.74 and 8,974.19 is: 13,460.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,660.97 : 30,990.74 = 8,974.19 : x
  2. Step 2: Convert to fraction form
    20,660.97/30,990.74 = 8,974.19/x
  3. Step 3: Cross multiply
    20,660.97x = 30,990.74 × 8,974.19
  4. Step 4: Simplify right side
    20,660.97x = 278,116,821.61
  5. Step 5: Solve for x
    x = 278,116,821.61/20,660.97
  6. Step 6: Final answer
    x = 13,460.97

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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.