Home / 11,278.40-16,922.40-7,121.60

Finding the Fourth Proportional to 11,278.40, 16,922.40 and 7,121.60

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Solution

The fourth proportional to 11,278.40, 16,922.40 and 7,121.60 is: 10,685.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,278.40 : 16,922.40 = 7,121.60 : x
  2. Step 2: Convert to fraction form
    11,278.40/16,922.40 = 7,121.60/x
  3. Step 3: Cross multiply
    11,278.40x = 16,922.40 × 7,121.60
  4. Step 4: Simplify right side
    11,278.40x = 120,514,563.84
  5. Step 5: Solve for x
    x = 120,514,563.84/11,278.40
  6. Step 6: Final answer
    x = 10,685.43

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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.