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Finding the Fourth Proportional to 20,620.92, 30,934.41 and 7,470.21

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Solution

The fourth proportional to 20,620.92, 30,934.41 and 7,470.21 is: 11,206.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,620.92 : 30,934.41 = 7,470.21 : x
  2. Step 2: Convert to fraction form
    20,620.92/30,934.41 = 7,470.21/x
  3. Step 3: Cross multiply
    20,620.92x = 30,934.41 × 7,470.21
  4. Step 4: Simplify right side
    20,620.92x = 231,086,538.93
  5. Step 5: Solve for x
    x = 231,086,538.93/20,620.92
  6. Step 6: Final answer
    x = 11,206.41

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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.