Home / 20,555.20-28,356.96-13,919.68

Finding the Fourth Proportional to 20,555.20, 28,356.96 and 13,919.68

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Solution

The fourth proportional to 20,555.20, 28,356.96 and 13,919.68 is: 19,202.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,555.20 : 28,356.96 = 13,919.68 : x
  2. Step 2: Convert to fraction form
    20,555.20/28,356.96 = 13,919.68/x
  3. Step 3: Cross multiply
    20,555.20x = 28,356.96 × 13,919.68
  4. Step 4: Simplify right side
    20,555.20x = 394,719,808.97
  5. Step 5: Solve for x
    x = 394,719,808.97/20,555.20
  6. Step 6: Final answer
    x = 19,202.92

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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.