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Finding the Fourth Proportional to 695.45, 959.80 and 396.78

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Solution

The fourth proportional to 695.45, 959.80 and 396.78 is: 547.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.45 : 959.80 = 396.78 : x
  2. Step 2: Convert to fraction form
    695.45/959.80 = 396.78/x
  3. Step 3: Cross multiply
    695.45x = 959.80 × 396.78
  4. Step 4: Simplify right side
    695.45x = 380,828.45
  5. Step 5: Solve for x
    x = 380,828.45/695.45
  6. Step 6: Final answer
    x = 547.60

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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.