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Finding the Fourth Proportional to 689.61, 951.57 and 394.86

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Solution

The fourth proportional to 689.61, 951.57 and 394.86 is: 544.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.61 : 951.57 = 394.86 : x
  2. Step 2: Convert to fraction form
    689.61/951.57 = 394.86/x
  3. Step 3: Cross multiply
    689.61x = 951.57 × 394.86
  4. Step 4: Simplify right side
    689.61x = 375,736.93
  5. Step 5: Solve for x
    x = 375,736.93/689.61
  6. Step 6: Final answer
    x = 544.85

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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.