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Finding the Fourth Proportional to 639.37, 958.20 and 274.06

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Solution

The fourth proportional to 639.37, 958.20 and 274.06 is: 410.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.37 : 958.20 = 274.06 : x
  2. Step 2: Convert to fraction form
    639.37/958.20 = 274.06/x
  3. Step 3: Cross multiply
    639.37x = 958.20 × 274.06
  4. Step 4: Simplify right side
    639.37x = 262,604.29
  5. Step 5: Solve for x
    x = 262,604.29/639.37
  6. Step 6: Final answer
    x = 410.72

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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.