Home / 20,137.72-30,206.60-6,990.12

Finding the Fourth Proportional to 20,137.72, 30,206.60 and 6,990.12

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Solution

The fourth proportional to 20,137.72, 30,206.60 and 6,990.12 is: 10,485.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,137.72 : 30,206.60 = 6,990.12 : x
  2. Step 2: Convert to fraction form
    20,137.72/30,206.60 = 6,990.12/x
  3. Step 3: Cross multiply
    20,137.72x = 30,206.60 × 6,990.12
  4. Step 4: Simplify right side
    20,137.72x = 211,147,758.79
  5. Step 5: Solve for x
    x = 211,147,758.79/20,137.72
  6. Step 6: Final answer
    x = 10,485.19

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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.