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Finding the Fourth Proportional to 689.84, 951.98 and 379.34

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Solution

The fourth proportional to 689.84, 951.98 and 379.34 is: 523.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.84 : 951.98 = 379.34 : x
  2. Step 2: Convert to fraction form
    689.84/951.98 = 379.34/x
  3. Step 3: Cross multiply
    689.84x = 951.98 × 379.34
  4. Step 4: Simplify right side
    689.84x = 361,119.22
  5. Step 5: Solve for x
    x = 361,119.22/689.84
  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.