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Finding the Fourth Proportional to 639.25, 958.31 and 274.27

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Solution

The fourth proportional to 639.25, 958.31 and 274.27 is: 411.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.25 : 958.31 = 274.27 : x
  2. Step 2: Convert to fraction form
    639.25/958.31 = 274.27/x
  3. Step 3: Cross multiply
    639.25x = 958.31 × 274.27
  4. Step 4: Simplify right side
    639.25x = 262,835.68
  5. Step 5: Solve for x
    x = 262,835.68/639.25
  6. Step 6: Final answer
    x = 411.16

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Double scale
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Similar ratio
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1.5x scale

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.