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Finding the Fourth Proportional to 689.75, 951.92 and 379.31

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Solution

The fourth proportional to 689.75, 951.92 and 379.31 is: 523.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.75 : 951.92 = 379.31 : x
  2. Step 2: Convert to fraction form
    689.75/951.92 = 379.31/x
  3. Step 3: Cross multiply
    689.75x = 951.92 × 379.31
  4. Step 4: Simplify right side
    689.75x = 361,070.88
  5. Step 5: Solve for x
    x = 361,070.88/689.75
  6. Step 6: Final answer
    x = 523.48

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1.5x scale

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.