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Finding the Fourth Proportional to 639.08, 958.73 and 228.13

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Solution

The fourth proportional to 639.08, 958.73 and 228.13 is: 342.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.08 : 958.73 = 228.13 : x
  2. Step 2: Convert to fraction form
    639.08/958.73 = 228.13/x
  3. Step 3: Cross multiply
    639.08x = 958.73 × 228.13
  4. Step 4: Simplify right side
    639.08x = 218,715.07
  5. Step 5: Solve for x
    x = 218,715.07/639.08
  6. Step 6: Final answer
    x = 342.23

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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.