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Finding the Fourth Proportional to 689.15, 951.09 and 394.34

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Solution

The fourth proportional to 689.15, 951.09 and 394.34 is: 544.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.15 : 951.09 = 394.34 : x
  2. Step 2: Convert to fraction form
    689.15/951.09 = 394.34/x
  3. Step 3: Cross multiply
    689.15x = 951.09 × 394.34
  4. Step 4: Simplify right side
    689.15x = 375,052.83
  5. Step 5: Solve for x
    x = 375,052.83/689.15
  6. Step 6: Final answer
    x = 544.23

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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.