Home / 20,928.92-28,889.49-13,857.62

Finding the Fourth Proportional to 20,928.92, 28,889.49 and 13,857.62

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Solution

The fourth proportional to 20,928.92, 28,889.49 and 13,857.62 is: 19,128.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,928.92 : 28,889.49 = 13,857.62 : x
  2. Step 2: Convert to fraction form
    20,928.92/28,889.49 = 13,857.62/x
  3. Step 3: Cross multiply
    20,928.92x = 28,889.49 × 13,857.62
  4. Step 4: Simplify right side
    20,928.92x = 400,339,360.68
  5. Step 5: Solve for x
    x = 400,339,360.68/20,928.92
  6. Step 6: Final answer
    x = 19,128.53

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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.