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Finding the Fourth Proportional to 279.43, 385.19 and 220.31

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Solution

The fourth proportional to 279.43, 385.19 and 220.31 is: 303.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.43 : 385.19 = 220.31 : x
  2. Step 2: Convert to fraction form
    279.43/385.19 = 220.31/x
  3. Step 3: Cross multiply
    279.43x = 385.19 × 220.31
  4. Step 4: Simplify right side
    279.43x = 84,860.11
  5. Step 5: Solve for x
    x = 84,860.11/279.43
  6. Step 6: Final answer
    x = 303.70

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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.