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Finding the Fourth Proportional to 638.94, 958.41 and 206.13

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Solution

The fourth proportional to 638.94, 958.41 and 206.13 is: 309.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.94 : 958.41 = 206.13 : x
  2. Step 2: Convert to fraction form
    638.94/958.41 = 206.13/x
  3. Step 3: Cross multiply
    638.94x = 958.41 × 206.13
  4. Step 4: Simplify right side
    638.94x = 197,557.05
  5. Step 5: Solve for x
    x = 197,557.05/638.94
  6. Step 6: Final answer
    x = 309.20

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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.