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Finding the Fourth Proportional to 863.28, 1,191.40 and 490.12

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Solution

The fourth proportional to 863.28, 1,191.40 and 490.12 is: 676.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.28 : 1,191.40 = 490.12 : x
  2. Step 2: Convert to fraction form
    863.28/1,191.40 = 490.12/x
  3. Step 3: Cross multiply
    863.28x = 1,191.40 × 490.12
  4. Step 4: Simplify right side
    863.28x = 583,928.97
  5. Step 5: Solve for x
    x = 583,928.97/863.28
  6. Step 6: Final answer
    x = 676.41

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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.