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Finding the Fourth Proportional to 639.18, 958.11 and 228.10

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Solution

The fourth proportional to 639.18, 958.11 and 228.10 is: 341.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.18 : 958.11 = 228.10 : x
  2. Step 2: Convert to fraction form
    639.18/958.11 = 228.10/x
  3. Step 3: Cross multiply
    639.18x = 958.11 × 228.10
  4. Step 4: Simplify right side
    639.18x = 218,544.89
  5. Step 5: Solve for x
    x = 218,544.89/639.18
  6. Step 6: Final answer
    x = 341.91

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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.