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Finding the Fourth Proportional to 638.46, 957.75 and 205.65

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Solution

The fourth proportional to 638.46, 957.75 and 205.65 is: 308.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.46 : 957.75 = 205.65 : x
  2. Step 2: Convert to fraction form
    638.46/957.75 = 205.65/x
  3. Step 3: Cross multiply
    638.46x = 957.75 × 205.65
  4. Step 4: Simplify right side
    638.46x = 196,961.29
  5. Step 5: Solve for x
    x = 196,961.29/638.46
  6. Step 6: Final answer
    x = 308.49

Related Problems

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Double scale
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Similar ratio
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1.5x scale

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.