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Finding the Fourth Proportional to 689.45, 951.68 and 394.82

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Solution

The fourth proportional to 689.45, 951.68 and 394.82 is: 544.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.45 : 951.68 = 394.82 : x
  2. Step 2: Convert to fraction form
    689.45/951.68 = 394.82/x
  3. Step 3: Cross multiply
    689.45x = 951.68 × 394.82
  4. Step 4: Simplify right side
    689.45x = 375,735.57
  5. Step 5: Solve for x
    x = 375,735.57/689.45
  6. Step 6: Final answer
    x = 544.98

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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.