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Finding the Fourth Proportional to 638.28, 957.30 and 273

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Solution

The fourth proportional to 638.28, 957.30 and 273 is: 409.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.28 : 957.30 = 273 : x
  2. Step 2: Convert to fraction form
    638.28/957.30 = 273/x
  3. Step 3: Cross multiply
    638.28x = 957.30 × 273
  4. Step 4: Simplify right side
    638.28x = 261,342.90
  5. Step 5: Solve for x
    x = 261,342.90/638.28
  6. Step 6: Final answer
    x = 409.45

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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.