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Finding the Fourth Proportional to 628.39, 867.21 and 348.66

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Solution

The fourth proportional to 628.39, 867.21 and 348.66 is: 481.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.39 : 867.21 = 348.66 : x
  2. Step 2: Convert to fraction form
    628.39/867.21 = 348.66/x
  3. Step 3: Cross multiply
    628.39x = 867.21 × 348.66
  4. Step 4: Simplify right side
    628.39x = 302,361.44
  5. Step 5: Solve for x
    x = 302,361.44/628.39
  6. Step 6: Final answer
    x = 481.17

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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.