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Finding the Fourth Proportional to 699.30, 963.72 and 488.79

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Solution

The fourth proportional to 699.30, 963.72 and 488.79 is: 673.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.30 : 963.72 = 488.79 : x
  2. Step 2: Convert to fraction form
    699.30/963.72 = 488.79/x
  3. Step 3: Cross multiply
    699.30x = 963.72 × 488.79
  4. Step 4: Simplify right side
    699.30x = 471,056.70
  5. Step 5: Solve for x
    x = 471,056.70/699.30
  6. Step 6: Final answer
    x = 673.61

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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.