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Finding the Fourth Proportional to 638.80, 957.92 and 243.41

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Solution

The fourth proportional to 638.80, 957.92 and 243.41 is: 365.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.80 : 957.92 = 243.41 : x
  2. Step 2: Convert to fraction form
    638.80/957.92 = 243.41/x
  3. Step 3: Cross multiply
    638.80x = 957.92 × 243.41
  4. Step 4: Simplify right side
    638.80x = 233,161.30
  5. Step 5: Solve for x
    x = 233,161.30/638.80
  6. Step 6: Final answer
    x = 365.00

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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.