Home / 20,816.30-28,735.87-13,272.75

Finding the Fourth Proportional to 20,816.30, 28,735.87 and 13,272.75

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Solution

The fourth proportional to 20,816.30, 28,735.87 and 13,272.75 is: 18,322.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,816.30 : 28,735.87 = 13,272.75 : x
  2. Step 2: Convert to fraction form
    20,816.30/28,735.87 = 13,272.75/x
  3. Step 3: Cross multiply
    20,816.30x = 28,735.87 × 13,272.75
  4. Step 4: Simplify right side
    20,816.30x = 381,404,018.54
  5. Step 5: Solve for x
    x = 381,404,018.54/20,816.30
  6. Step 6: Final answer
    x = 18,322.37

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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.