Home / 20,128.90-30,198.57-7,649.14

Finding the Fourth Proportional to 20,128.90, 30,198.57 and 7,649.14

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Solution

The fourth proportional to 20,128.90, 30,198.57 and 7,649.14 is: 11,475.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,128.90 : 30,198.57 = 7,649.14 : x
  2. Step 2: Convert to fraction form
    20,128.90/30,198.57 = 7,649.14/x
  3. Step 3: Cross multiply
    20,128.90x = 30,198.57 × 7,649.14
  4. Step 4: Simplify right side
    20,128.90x = 230,993,089.73
  5. Step 5: Solve for x
    x = 230,993,089.73/20,128.90
  6. Step 6: Final answer
    x = 11,475.69

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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.