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Finding the Fourth Proportional to 279.55, 419.37 and 171.19

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Solution

The fourth proportional to 279.55, 419.37 and 171.19 is: 256.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.55 : 419.37 = 171.19 : x
  2. Step 2: Convert to fraction form
    279.55/419.37 = 171.19/x
  3. Step 3: Cross multiply
    279.55x = 419.37 × 171.19
  4. Step 4: Simplify right side
    279.55x = 71,791.95
  5. Step 5: Solve for x
    x = 71,791.95/279.55
  6. Step 6: Final answer
    x = 256.81

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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.