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Finding the Fourth Proportional to 20,479.25, 30,720.26 and 6,964.92

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Solution

The fourth proportional to 20,479.25, 30,720.26 and 6,964.92 is: 10,447.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,479.25 : 30,720.26 = 6,964.92 : x
  2. Step 2: Convert to fraction form
    20,479.25/30,720.26 = 6,964.92/x
  3. Step 3: Cross multiply
    20,479.25x = 30,720.26 × 6,964.92
  4. Step 4: Simplify right side
    20,479.25x = 213,964,170.69
  5. Step 5: Solve for x
    x = 213,964,170.69/20,479.25
  6. Step 6: Final answer
    x = 10,447.85

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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.