Home / 20,138.10-30,207.15-6,991.80

Finding the Fourth Proportional to 20,138.10, 30,207.15 and 6,991.80

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Solution

The fourth proportional to 20,138.10, 30,207.15 and 6,991.80 is: 10,487.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,138.10 : 30,207.15 = 6,991.80 : x
  2. Step 2: Convert to fraction form
    20,138.10/30,207.15 = 6,991.80/x
  3. Step 3: Cross multiply
    20,138.10x = 30,207.15 × 6,991.80
  4. Step 4: Simplify right side
    20,138.10x = 211,202,351.37
  5. Step 5: Solve for x
    x = 211,202,351.37/20,138.10
  6. Step 6: Final answer
    x = 10,487.70

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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.