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Finding the Fourth Proportional to 20,422.80, 30,636.10 and 7,943.78

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Solution

The fourth proportional to 20,422.80, 30,636.10 and 7,943.78 is: 11,916.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,422.80 : 30,636.10 = 7,943.78 : x
  2. Step 2: Convert to fraction form
    20,422.80/30,636.10 = 7,943.78/x
  3. Step 3: Cross multiply
    20,422.80x = 30,636.10 × 7,943.78
  4. Step 4: Simplify right side
    20,422.80x = 243,366,438.46
  5. Step 5: Solve for x
    x = 243,366,438.46/20,422.80
  6. Step 6: Final answer
    x = 11,916.41

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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.