Home / 20,743.86-31,120.65-12,747.54

Finding the Fourth Proportional to 20,743.86, 31,120.65 and 12,747.54

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Solution

The fourth proportional to 20,743.86, 31,120.65 and 12,747.54 is: 19,124.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,743.86 : 31,120.65 = 12,747.54 : x
  2. Step 2: Convert to fraction form
    20,743.86/31,120.65 = 12,747.54/x
  3. Step 3: Cross multiply
    20,743.86x = 31,120.65 × 12,747.54
  4. Step 4: Simplify right side
    20,743.86x = 396,711,730.70
  5. Step 5: Solve for x
    x = 396,711,730.70/20,743.86
  6. Step 6: Final answer
    x = 19,124.30

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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.