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Finding the Fourth Proportional to 863.18, 1,191.24 and 490.18

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Solution

The fourth proportional to 863.18, 1,191.24 and 490.18 is: 676.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.18 : 1,191.24 = 490.18 : x
  2. Step 2: Convert to fraction form
    863.18/1,191.24 = 490.18/x
  3. Step 3: Cross multiply
    863.18x = 1,191.24 × 490.18
  4. Step 4: Simplify right side
    863.18x = 583,922.02
  5. Step 5: Solve for x
    x = 583,922.02/863.18
  6. Step 6: Final answer
    x = 676.48

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Half scale
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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.