Home / 20,138.30-30,207.45-13,139.90

Finding the Fourth Proportional to 20,138.30, 30,207.45 and 13,139.90

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Solution

The fourth proportional to 20,138.30, 30,207.45 and 13,139.90 is: 19,709.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,138.30 : 30,207.45 = 13,139.90 : x
  2. Step 2: Convert to fraction form
    20,138.30/30,207.45 = 13,139.90/x
  3. Step 3: Cross multiply
    20,138.30x = 30,207.45 × 13,139.90
  4. Step 4: Simplify right side
    20,138.30x = 396,922,872.26
  5. Step 5: Solve for x
    x = 396,922,872.26/20,138.30
  6. Step 6: Final answer
    x = 19,709.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.