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Finding the Fourth Proportional to 639.17, 958.86 and 228.27

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Solution

The fourth proportional to 639.17, 958.86 and 228.27 is: 342.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.17 : 958.86 = 228.27 : x
  2. Step 2: Convert to fraction form
    639.17/958.86 = 228.27/x
  3. Step 3: Cross multiply
    639.17x = 958.86 × 228.27
  4. Step 4: Simplify right side
    639.17x = 218,877.82
  5. Step 5: Solve for x
    x = 218,877.82/639.17
  6. Step 6: Final answer
    x = 342.44

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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.