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Finding the Fourth Proportional to 279.53, 418.81 and 171.09

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Solution

The fourth proportional to 279.53, 418.81 and 171.09 is: 256.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.53 : 418.81 = 171.09 : x
  2. Step 2: Convert to fraction form
    279.53/418.81 = 171.09/x
  3. Step 3: Cross multiply
    279.53x = 418.81 × 171.09
  4. Step 4: Simplify right side
    279.53x = 71,652.11
  5. Step 5: Solve for x
    x = 71,652.11/279.53
  6. Step 6: Final answer
    x = 256.34

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.