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Finding the Fourth Proportional to 695.78, 959.20 and 518.39

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Solution

The fourth proportional to 695.78, 959.20 and 518.39 is: 714.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.78 : 959.20 = 518.39 : x
  2. Step 2: Convert to fraction form
    695.78/959.20 = 518.39/x
  3. Step 3: Cross multiply
    695.78x = 959.20 × 518.39
  4. Step 4: Simplify right side
    695.78x = 497,239.69
  5. Step 5: Solve for x
    x = 497,239.69/695.78
  6. Step 6: Final answer
    x = 714.65

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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.