Home / 20,390.24-28,138.80-11,439.68

Finding the Fourth Proportional to 20,390.24, 28,138.80 and 11,439.68

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Solution

The fourth proportional to 20,390.24, 28,138.80 and 11,439.68 is: 15,786.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.24 : 28,138.80 = 11,439.68 : x
  2. Step 2: Convert to fraction form
    20,390.24/28,138.80 = 11,439.68/x
  3. Step 3: Cross multiply
    20,390.24x = 28,138.80 × 11,439.68
  4. Step 4: Simplify right side
    20,390.24x = 321,898,867.58
  5. Step 5: Solve for x
    x = 321,898,867.58/20,390.24
  6. Step 6: Final answer
    x = 15,786.91

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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.