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Finding the Fourth Proportional to 863.28, 1,191.33 and 513.95

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Solution

The fourth proportional to 863.28, 1,191.33 and 513.95 is: 709.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.28 : 1,191.33 = 513.95 : x
  2. Step 2: Convert to fraction form
    863.28/1,191.33 = 513.95/x
  3. Step 3: Cross multiply
    863.28x = 1,191.33 × 513.95
  4. Step 4: Simplify right side
    863.28x = 612,278.10
  5. Step 5: Solve for x
    x = 612,278.10/863.28
  6. Step 6: Final answer
    x = 709.25

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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.