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Finding the Fourth Proportional to 639.23, 958.55 and 249.42

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Solution

The fourth proportional to 639.23, 958.55 and 249.42 is: 374.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.23 : 958.55 = 249.42 : x
  2. Step 2: Convert to fraction form
    639.23/958.55 = 249.42/x
  3. Step 3: Cross multiply
    639.23x = 958.55 × 249.42
  4. Step 4: Simplify right side
    639.23x = 239,080.29
  5. Step 5: Solve for x
    x = 239,080.29/639.23
  6. Step 6: Final answer
    x = 374.02

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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.