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Finding the Fourth Proportional to 638, 957 and 205.19

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Solution

The fourth proportional to 638, 957 and 205.19 is: 307.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    638 : 957 = 205.19 : x
  2. Step 2: Convert to fraction form
    638/957 = 205.19/x
  3. Step 3: Cross multiply
    638x = 957 × 205.19
  4. Step 4: Simplify right side
    638x = 196,366.83
  5. Step 5: Solve for x
    x = 196,366.83/638
  6. Step 6: Final answer
    x = 307.79

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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.