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Finding the Fourth Proportional to 639.98, 959.04 and 274.25

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Solution

The fourth proportional to 639.98, 959.04 and 274.25 is: 410.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.98 : 959.04 = 274.25 : x
  2. Step 2: Convert to fraction form
    639.98/959.04 = 274.25/x
  3. Step 3: Cross multiply
    639.98x = 959.04 × 274.25
  4. Step 4: Simplify right side
    639.98x = 263,016.72
  5. Step 5: Solve for x
    x = 263,016.72/639.98
  6. Step 6: Final answer
    x = 410.98

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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.