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Finding the Fourth Proportional to 628.92, 867.88 and 349.15

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Solution

The fourth proportional to 628.92, 867.88 and 349.15 is: 481.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.92 : 867.88 = 349.15 : x
  2. Step 2: Convert to fraction form
    628.92/867.88 = 349.15/x
  3. Step 3: Cross multiply
    628.92x = 867.88 × 349.15
  4. Step 4: Simplify right side
    628.92x = 303,020.30
  5. Step 5: Solve for x
    x = 303,020.30/628.92
  6. Step 6: Final answer
    x = 481.81

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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.