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Finding the Fourth Proportional to 863.46, 1,185.20 and 768.12

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Solution

The fourth proportional to 863.46, 1,185.20 and 768.12 is: 1,054.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.46 : 1,185.20 = 768.12 : x
  2. Step 2: Convert to fraction form
    863.46/1,185.20 = 768.12/x
  3. Step 3: Cross multiply
    863.46x = 1,185.20 × 768.12
  4. Step 4: Simplify right side
    863.46x = 910,370.42
  5. Step 5: Solve for x
    x = 910,370.42/863.46
  6. Step 6: Final answer
    x = 1,054.33

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.