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Finding the Fourth Proportional to 863.18, 1,191.14 and 490.11

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Solution

The fourth proportional to 863.18, 1,191.14 and 490.11 is: 676.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.18 : 1,191.14 = 490.11 : x
  2. Step 2: Convert to fraction form
    863.18/1,191.14 = 490.11/x
  3. Step 3: Cross multiply
    863.18x = 1,191.14 × 490.11
  4. Step 4: Simplify right side
    863.18x = 583,789.54
  5. Step 5: Solve for x
    x = 583,789.54/863.18
  6. Step 6: Final answer
    x = 676.33

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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.