Home / 20,142.12-30,209.40-6,991.80

Finding the Fourth Proportional to 20,142.12, 30,209.40 and 6,991.80

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Solution

The fourth proportional to 20,142.12, 30,209.40 and 6,991.80 is: 10,486.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,142.12 : 30,209.40 = 6,991.80 : x
  2. Step 2: Convert to fraction form
    20,142.12/30,209.40 = 6,991.80/x
  3. Step 3: Cross multiply
    20,142.12x = 30,209.40 × 6,991.80
  4. Step 4: Simplify right side
    20,142.12x = 211,218,082.92
  5. Step 5: Solve for x
    x = 211,218,082.92/20,142.12
  6. Step 6: Final answer
    x = 10,486.39

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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.