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Finding the Fourth Proportional to 618.31, 927.78 and 289.36

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Solution

The fourth proportional to 618.31, 927.78 and 289.36 is: 434.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.31 : 927.78 = 289.36 : x
  2. Step 2: Convert to fraction form
    618.31/927.78 = 289.36/x
  3. Step 3: Cross multiply
    618.31x = 927.78 × 289.36
  4. Step 4: Simplify right side
    618.31x = 268,462.42
  5. Step 5: Solve for x
    x = 268,462.42/618.31
  6. Step 6: Final answer
    x = 434.19

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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.