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Finding the Fourth Proportional to 639.23, 958.99 and 228.41

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Solution

The fourth proportional to 639.23, 958.99 and 228.41 is: 342.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.23 : 958.99 = 228.41 : x
  2. Step 2: Convert to fraction form
    639.23/958.99 = 228.41/x
  3. Step 3: Cross multiply
    639.23x = 958.99 × 228.41
  4. Step 4: Simplify right side
    639.23x = 219,037.54
  5. Step 5: Solve for x
    x = 219,037.54/639.23
  6. Step 6: Final answer
    x = 342.66

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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.