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Finding the Fourth Proportional to 689.82, 951.63 and 480.49

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Solution

The fourth proportional to 689.82, 951.63 and 480.49 is: 662.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.82 : 951.63 = 480.49 : x
  2. Step 2: Convert to fraction form
    689.82/951.63 = 480.49/x
  3. Step 3: Cross multiply
    689.82x = 951.63 × 480.49
  4. Step 4: Simplify right side
    689.82x = 457,248.70
  5. Step 5: Solve for x
    x = 457,248.70/689.82
  6. Step 6: Final answer
    x = 662.85

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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.