Home / 20,940.78-28,898.37-11,509.95

Finding the Fourth Proportional to 20,940.78, 28,898.37 and 11,509.95

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Solution

The fourth proportional to 20,940.78, 28,898.37 and 11,509.95 is: 15,883.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,940.78 : 28,898.37 = 11,509.95 : x
  2. Step 2: Convert to fraction form
    20,940.78/28,898.37 = 11,509.95/x
  3. Step 3: Cross multiply
    20,940.78x = 28,898.37 × 11,509.95
  4. Step 4: Simplify right side
    20,940.78x = 332,618,793.78
  5. Step 5: Solve for x
    x = 332,618,793.78/20,940.78
  6. Step 6: Final answer
    x = 15,883.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.