Home / 20,380.12-28,124.07-11,427.59

Finding the Fourth Proportional to 20,380.12, 28,124.07 and 11,427.59

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Solution

The fourth proportional to 20,380.12, 28,124.07 and 11,427.59 is: 15,769.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,380.12 : 28,124.07 = 11,427.59 : x
  2. Step 2: Convert to fraction form
    20,380.12/28,124.07 = 11,427.59/x
  3. Step 3: Cross multiply
    20,380.12x = 28,124.07 × 11,427.59
  4. Step 4: Simplify right side
    20,380.12x = 321,390,341.09
  5. Step 5: Solve for x
    x = 321,390,341.09/20,380.12
  6. Step 6: Final answer
    x = 15,769.80

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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.