Home / 1,721.75-2,375.15-1,091.21

Finding the Fourth Proportional to 1,721.75, 2,375.15 and 1,091.21

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Solution

The fourth proportional to 1,721.75, 2,375.15 and 1,091.21 is: 1,505.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,721.75 : 2,375.15 = 1,091.21 : x
  2. Step 2: Convert to fraction form
    1,721.75/2,375.15 = 1,091.21/x
  3. Step 3: Cross multiply
    1,721.75x = 2,375.15 × 1,091.21
  4. Step 4: Simplify right side
    1,721.75x = 2,591,770.10
  5. Step 5: Solve for x
    x = 2,591,770.10/1,721.75
  6. Step 6: Final answer
    x = 1,505.32

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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.