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Finding the Fourth Proportional to 639.49, 959.26 and 249.45

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Solution

The fourth proportional to 639.49, 959.26 and 249.45 is: 374.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.49 : 959.26 = 249.45 : x
  2. Step 2: Convert to fraction form
    639.49/959.26 = 249.45/x
  3. Step 3: Cross multiply
    639.49x = 959.26 × 249.45
  4. Step 4: Simplify right side
    639.49x = 239,292.27
  5. Step 5: Solve for x
    x = 239,292.27/639.49
  6. Step 6: Final answer
    x = 374.19

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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.