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Finding the Fourth Proportional to 628.78, 867.75 and 349.05

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Solution

The fourth proportional to 628.78, 867.75 and 349.05 is: 481.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.78 : 867.75 = 349.05 : x
  2. Step 2: Convert to fraction form
    628.78/867.75 = 349.05/x
  3. Step 3: Cross multiply
    628.78x = 867.75 × 349.05
  4. Step 4: Simplify right side
    628.78x = 302,888.14
  5. Step 5: Solve for x
    x = 302,888.14/628.78
  6. Step 6: Final answer
    x = 481.71

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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.