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Finding the Fourth Proportional to 639.42, 958.95 and 228.33

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Solution

The fourth proportional to 639.42, 958.95 and 228.33 is: 342.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.42 : 958.95 = 228.33 : x
  2. Step 2: Convert to fraction form
    639.42/958.95 = 228.33/x
  3. Step 3: Cross multiply
    639.42x = 958.95 × 228.33
  4. Step 4: Simplify right side
    639.42x = 218,957.05
  5. Step 5: Solve for x
    x = 218,957.05/639.42
  6. Step 6: Final answer
    x = 342.43

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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.