Home / 1,619.40-2,234.78-911.22

Finding the Fourth Proportional to 1,619.40, 2,234.78 and 911.22

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Solution

The fourth proportional to 1,619.40, 2,234.78 and 911.22 is: 1,257.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,619.40 : 2,234.78 = 911.22 : x
  2. Step 2: Convert to fraction form
    1,619.40/2,234.78 = 911.22/x
  3. Step 3: Cross multiply
    1,619.40x = 2,234.78 × 911.22
  4. Step 4: Simplify right side
    1,619.40x = 2,036,371.68
  5. Step 5: Solve for x
    x = 2,036,371.68/1,619.40
  6. Step 6: Final answer
    x = 1,257.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.