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Finding the Fourth Proportional to 279.28, 385.36 and 162.78

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Solution

The fourth proportional to 279.28, 385.36 and 162.78 is: 224.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.28 : 385.36 = 162.78 : x
  2. Step 2: Convert to fraction form
    279.28/385.36 = 162.78/x
  3. Step 3: Cross multiply
    279.28x = 385.36 × 162.78
  4. Step 4: Simplify right side
    279.28x = 62,728.90
  5. Step 5: Solve for x
    x = 62,728.90/279.28
  6. Step 6: Final answer
    x = 224.61

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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.