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Finding the Fourth Proportional to 689.17, 950.91 and 394.39

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Solution

The fourth proportional to 689.17, 950.91 and 394.39 is: 544.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.17 : 950.91 = 394.39 : x
  2. Step 2: Convert to fraction form
    689.17/950.91 = 394.39/x
  3. Step 3: Cross multiply
    689.17x = 950.91 × 394.39
  4. Step 4: Simplify right side
    689.17x = 375,029.39
  5. Step 5: Solve for x
    x = 375,029.39/689.17
  6. Step 6: Final answer
    x = 544.18

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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.