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Finding the Fourth Proportional to 20,422.68, 30,635.91 and 7,943.65

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Solution

The fourth proportional to 20,422.68, 30,635.91 and 7,943.65 is: 11,916.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,422.68 : 30,635.91 = 7,943.65 : x
  2. Step 2: Convert to fraction form
    20,422.68/30,635.91 = 7,943.65/x
  3. Step 3: Cross multiply
    20,422.68x = 30,635.91 × 7,943.65
  4. Step 4: Simplify right side
    20,422.68x = 243,361,023.06
  5. Step 5: Solve for x
    x = 243,361,023.06/20,422.68
  6. Step 6: Final answer
    x = 11,916.21

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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.