Home / 20,478.12-30,711.71-12,629.52

Finding the Fourth Proportional to 20,478.12, 30,711.71 and 12,629.52

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Solution

The fourth proportional to 20,478.12, 30,711.71 and 12,629.52 is: 18,940.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,478.12 : 30,711.71 = 12,629.52 : x
  2. Step 2: Convert to fraction form
    20,478.12/30,711.71 = 12,629.52/x
  3. Step 3: Cross multiply
    20,478.12x = 30,711.71 × 12,629.52
  4. Step 4: Simplify right side
    20,478.12x = 387,874,092.53
  5. Step 5: Solve for x
    x = 387,874,092.53/20,478.12
  6. Step 6: Final answer
    x = 18,940.90

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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.