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Finding the Fourth Proportional to 863.80, 1,192.14 and 514.40

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Solution

The fourth proportional to 863.80, 1,192.14 and 514.40 is: 709.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.80 : 1,192.14 = 514.40 : x
  2. Step 2: Convert to fraction form
    863.80/1,192.14 = 514.40/x
  3. Step 3: Cross multiply
    863.80x = 1,192.14 × 514.40
  4. Step 4: Simplify right side
    863.80x = 613,236.82
  5. Step 5: Solve for x
    x = 613,236.82/863.80
  6. Step 6: Final answer
    x = 709.93

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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.