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Finding the Fourth Proportional to 1,191.15, 1,787.01 and 411.12

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Solution

The fourth proportional to 1,191.15, 1,787.01 and 411.12 is: 616.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.15 : 1,787.01 = 411.12 : x
  2. Step 2: Convert to fraction form
    1,191.15/1,787.01 = 411.12/x
  3. Step 3: Cross multiply
    1,191.15x = 1,787.01 × 411.12
  4. Step 4: Simplify right side
    1,191.15x = 734,675.55
  5. Step 5: Solve for x
    x = 734,675.55/1,191.15
  6. Step 6: Final answer
    x = 616.78

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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.