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Finding the Fourth Proportional to 1,191.18, 1,786.71 and 411.18

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Solution

The fourth proportional to 1,191.18, 1,786.71 and 411.18 is: 616.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.18 : 1,786.71 = 411.18 : x
  2. Step 2: Convert to fraction form
    1,191.18/1,786.71 = 411.18/x
  3. Step 3: Cross multiply
    1,191.18x = 1,786.71 × 411.18
  4. Step 4: Simplify right side
    1,191.18x = 734,659.42
  5. Step 5: Solve for x
    x = 734,659.42/1,191.18
  6. Step 6: Final answer
    x = 616.75

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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.