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Finding the Fourth Proportional to 618.68, 927.92 and 207.72

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Solution

The fourth proportional to 618.68, 927.92 and 207.72 is: 311.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.68 : 927.92 = 207.72 : x
  2. Step 2: Convert to fraction form
    618.68/927.92 = 207.72/x
  3. Step 3: Cross multiply
    618.68x = 927.92 × 207.72
  4. Step 4: Simplify right side
    618.68x = 192,747.54
  5. Step 5: Solve for x
    x = 192,747.54/618.68
  6. Step 6: Final answer
    x = 311.55

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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.