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Finding the Fourth Proportional to 638.15, 957.45 and 273.21

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Solution

The fourth proportional to 638.15, 957.45 and 273.21 is: 409.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.15 : 957.45 = 273.21 : x
  2. Step 2: Convert to fraction form
    638.15/957.45 = 273.21/x
  3. Step 3: Cross multiply
    638.15x = 957.45 × 273.21
  4. Step 4: Simplify right side
    638.15x = 261,584.91
  5. Step 5: Solve for x
    x = 261,584.91/638.15
  6. Step 6: Final answer
    x = 409.91

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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.