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Finding the Fourth Proportional to 689.44, 951.54 and 394.80

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Solution

The fourth proportional to 689.44, 951.54 and 394.80 is: 544.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.44 : 951.54 = 394.80 : x
  2. Step 2: Convert to fraction form
    689.44/951.54 = 394.80/x
  3. Step 3: Cross multiply
    689.44x = 951.54 × 394.80
  4. Step 4: Simplify right side
    689.44x = 375,667.99
  5. Step 5: Solve for x
    x = 375,667.99/689.44
  6. Step 6: Final answer
    x = 544.89

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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.