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Finding the Fourth Proportional to 863.76, 1,191.90 and 514.38

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Solution

The fourth proportional to 863.76, 1,191.90 and 514.38 is: 709.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.76 : 1,191.90 = 514.38 : x
  2. Step 2: Convert to fraction form
    863.76/1,191.90 = 514.38/x
  3. Step 3: Cross multiply
    863.76x = 1,191.90 × 514.38
  4. Step 4: Simplify right side
    863.76x = 613,089.52
  5. Step 5: Solve for x
    x = 613,089.52/863.76
  6. Step 6: Final answer
    x = 709.79

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Double scale
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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.