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Finding the Fourth Proportional to 279.63, 386.67 and 255.12

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Solution

The fourth proportional to 279.63, 386.67 and 255.12 is: 352.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.63 : 386.67 = 255.12 : x
  2. Step 2: Convert to fraction form
    279.63/386.67 = 255.12/x
  3. Step 3: Cross multiply
    279.63x = 386.67 × 255.12
  4. Step 4: Simplify right side
    279.63x = 98,647.25
  5. Step 5: Solve for x
    x = 98,647.25/279.63
  6. Step 6: Final answer
    x = 352.78

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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.