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Finding the Fourth Proportional to 639.13, 958.12 and 228.17

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Solution

The fourth proportional to 639.13, 958.12 and 228.17 is: 342.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.13 : 958.12 = 228.17 : x
  2. Step 2: Convert to fraction form
    639.13/958.12 = 228.17/x
  3. Step 3: Cross multiply
    639.13x = 958.12 × 228.17
  4. Step 4: Simplify right side
    639.13x = 218,614.24
  5. Step 5: Solve for x
    x = 218,614.24/639.13
  6. Step 6: Final answer
    x = 342.05

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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.