Home / 20,390.20-28,139.82-11,438.32

Finding the Fourth Proportional to 20,390.20, 28,139.82 and 11,438.32

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Solution

The fourth proportional to 20,390.20, 28,139.82 and 11,438.32 is: 15,785.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.20 : 28,139.82 = 11,438.32 : x
  2. Step 2: Convert to fraction form
    20,390.20/28,139.82 = 11,438.32/x
  3. Step 3: Cross multiply
    20,390.20x = 28,139.82 × 11,438.32
  4. Step 4: Simplify right side
    20,390.20x = 321,872,265.90
  5. Step 5: Solve for x
    x = 321,872,265.90/20,390.20
  6. Step 6: Final answer
    x = 15,785.64

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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.