Home / 20,390.80-28,140.42-11,441.14

Finding the Fourth Proportional to 20,390.80, 28,140.42 and 11,441.14

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Solution

The fourth proportional to 20,390.80, 28,140.42 and 11,441.14 is: 15,789.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.80 : 28,140.42 = 11,441.14 : x
  2. Step 2: Convert to fraction form
    20,390.80/28,140.42 = 11,441.14/x
  3. Step 3: Cross multiply
    20,390.80x = 28,140.42 × 11,441.14
  4. Step 4: Simplify right side
    20,390.80x = 321,958,484.88
  5. Step 5: Solve for x
    x = 321,958,484.88/20,390.80
  6. Step 6: Final answer
    x = 15,789.40

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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.