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Finding the Fourth Proportional to 639.50, 958.58 and 274.52

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Solution

The fourth proportional to 639.50, 958.58 and 274.52 is: 411.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.50 : 958.58 = 274.52 : x
  2. Step 2: Convert to fraction form
    639.50/958.58 = 274.52/x
  3. Step 3: Cross multiply
    639.50x = 958.58 × 274.52
  4. Step 4: Simplify right side
    639.50x = 263,149.38
  5. Step 5: Solve for x
    x = 263,149.38/639.50
  6. Step 6: Final answer
    x = 411.49

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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.