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Finding the Fourth Proportional to 638.62, 957.13 and 272.98

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Solution

The fourth proportional to 638.62, 957.13 and 272.98 is: 409.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.62 : 957.13 = 272.98 : x
  2. Step 2: Convert to fraction form
    638.62/957.13 = 272.98/x
  3. Step 3: Cross multiply
    638.62x = 957.13 × 272.98
  4. Step 4: Simplify right side
    638.62x = 261,272.56
  5. Step 5: Solve for x
    x = 261,272.56/638.62
  6. Step 6: Final answer
    x = 409.12

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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.