Home / 20,121.10-30,181.65-11,805.10

Finding the Fourth Proportional to 20,121.10, 30,181.65 and 11,805.10

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Solution

The fourth proportional to 20,121.10, 30,181.65 and 11,805.10 is: 17,707.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,121.10 : 30,181.65 = 11,805.10 : x
  2. Step 2: Convert to fraction form
    20,121.10/30,181.65 = 11,805.10/x
  3. Step 3: Cross multiply
    20,121.10x = 30,181.65 × 11,805.10
  4. Step 4: Simplify right side
    20,121.10x = 356,297,396.42
  5. Step 5: Solve for x
    x = 356,297,396.42/20,121.10
  6. Step 6: Final answer
    x = 17,707.65

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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.