Home / 20,379.12-28,122.69-11,426.59

Finding the Fourth Proportional to 20,379.12, 28,122.69 and 11,426.59

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Solution

The fourth proportional to 20,379.12, 28,122.69 and 11,426.59 is: 15,768.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,379.12 : 28,122.69 = 11,426.59 : x
  2. Step 2: Convert to fraction form
    20,379.12/28,122.69 = 11,426.59/x
  3. Step 3: Cross multiply
    20,379.12x = 28,122.69 × 11,426.59
  4. Step 4: Simplify right side
    20,379.12x = 321,346,448.33
  5. Step 5: Solve for x
    x = 321,346,448.33/20,379.12
  6. Step 6: Final answer
    x = 15,768.42

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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.