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Finding the Fourth Proportional to 863.20, 1,191.30 and 513.88

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Solution

The fourth proportional to 863.20, 1,191.30 and 513.88 is: 709.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.20 : 1,191.30 = 513.88 : x
  2. Step 2: Convert to fraction form
    863.20/1,191.30 = 513.88/x
  3. Step 3: Cross multiply
    863.20x = 1,191.30 × 513.88
  4. Step 4: Simplify right side
    863.20x = 612,185.24
  5. Step 5: Solve for x
    x = 612,185.24/863.20
  6. Step 6: Final answer
    x = 709.20

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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.