Home / 20,286.38-30,429.78-7,138.88

Finding the Fourth Proportional to 20,286.38, 30,429.78 and 7,138.88

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Solution

The fourth proportional to 20,286.38, 30,429.78 and 7,138.88 is: 10,708.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,286.38 : 30,429.78 = 7,138.88 : x
  2. Step 2: Convert to fraction form
    20,286.38/30,429.78 = 7,138.88/x
  3. Step 3: Cross multiply
    20,286.38x = 30,429.78 × 7,138.88
  4. Step 4: Simplify right side
    20,286.38x = 217,234,547.85
  5. Step 5: Solve for x
    x = 217,234,547.85/20,286.38
  6. Step 6: Final answer
    x = 10,708.39

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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.