Home / 20,881.87-28,816.83-11,321.78

Finding the Fourth Proportional to 20,881.87, 28,816.83 and 11,321.78

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Solution

The fourth proportional to 20,881.87, 28,816.83 and 11,321.78 is: 15,623.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,881.87 : 28,816.83 = 11,321.78 : x
  2. Step 2: Convert to fraction form
    20,881.87/28,816.83 = 11,321.78/x
  3. Step 3: Cross multiply
    20,881.87x = 28,816.83 × 11,321.78
  4. Step 4: Simplify right side
    20,881.87x = 326,257,665.47
  5. Step 5: Solve for x
    x = 326,257,665.47/20,881.87
  6. Step 6: Final answer
    x = 15,623.97

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1.5x scale

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.