Home / 1,619.88-2,235.36-911.85

Finding the Fourth Proportional to 1,619.88, 2,235.36 and 911.85

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Solution

The fourth proportional to 1,619.88, 2,235.36 and 911.85 is: 1,258.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,619.88 : 2,235.36 = 911.85 : x
  2. Step 2: Convert to fraction form
    1,619.88/2,235.36 = 911.85/x
  3. Step 3: Cross multiply
    1,619.88x = 2,235.36 × 911.85
  4. Step 4: Simplify right side
    1,619.88x = 2,038,313.02
  5. Step 5: Solve for x
    x = 2,038,313.02/1,619.88
  6. Step 6: Final answer
    x = 1,258.31

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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.