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Finding the Fourth Proportional to 639.12, 957.88 and 273.48

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Solution

The fourth proportional to 639.12, 957.88 and 273.48 is: 409.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.12 : 957.88 = 273.48 : x
  2. Step 2: Convert to fraction form
    639.12/957.88 = 273.48/x
  3. Step 3: Cross multiply
    639.12x = 957.88 × 273.48
  4. Step 4: Simplify right side
    639.12x = 261,956.23
  5. Step 5: Solve for x
    x = 261,956.23/639.12
  6. Step 6: Final answer
    x = 409.87

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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.