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Finding the Fourth Proportional to 639.45, 958.55 and 274.14

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Solution

The fourth proportional to 639.45, 958.55 and 274.14 is: 410.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.45 : 958.55 = 274.14 : x
  2. Step 2: Convert to fraction form
    639.45/958.55 = 274.14/x
  3. Step 3: Cross multiply
    639.45x = 958.55 × 274.14
  4. Step 4: Simplify right side
    639.45x = 262,775.53
  5. Step 5: Solve for x
    x = 262,775.53/639.45
  6. Step 6: Final answer
    x = 410.94

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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.