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Finding the Fourth Proportional to 639.21, 958.92 and 274.00

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Solution

The fourth proportional to 639.21, 958.92 and 274.00 is: 411.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.21 : 958.92 = 274.00 : x
  2. Step 2: Convert to fraction form
    639.21/958.92 = 274.00/x
  3. Step 3: Cross multiply
    639.21x = 958.92 × 274.00
  4. Step 4: Simplify right side
    639.21x = 262,743.99
  5. Step 5: Solve for x
    x = 262,743.99/639.21
  6. Step 6: Final answer
    x = 411.05

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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.