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Finding the Fourth Proportional to 279.78, 386.04 and 163.38

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Solution

The fourth proportional to 279.78, 386.04 and 163.38 is: 225.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.78 : 386.04 = 163.38 : x
  2. Step 2: Convert to fraction form
    279.78/386.04 = 163.38/x
  3. Step 3: Cross multiply
    279.78x = 386.04 × 163.38
  4. Step 4: Simplify right side
    279.78x = 63,071.22
  5. Step 5: Solve for x
    x = 63,071.22/279.78
  6. Step 6: Final answer
    x = 225.43

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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.