Home / 1,191.21-1,786.55-411.18

Finding the Fourth Proportional to 1,191.21, 1,786.55 and 411.18

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Solution

The fourth proportional to 1,191.21, 1,786.55 and 411.18 is: 616.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.21 : 1,786.55 = 411.18 : x
  2. Step 2: Convert to fraction form
    1,191.21/1,786.55 = 411.18/x
  3. Step 3: Cross multiply
    1,191.21x = 1,786.55 × 411.18
  4. Step 4: Simplify right side
    1,191.21x = 734,591.57
  5. Step 5: Solve for x
    x = 734,591.57/1,191.21
  6. Step 6: Final answer
    x = 616.68

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Double scale
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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.