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Finding the Fourth Proportional to 618.73, 854.03 and 397.69

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Solution

The fourth proportional to 618.73, 854.03 and 397.69 is: 548.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.73 : 854.03 = 397.69 : x
  2. Step 2: Convert to fraction form
    618.73/854.03 = 397.69/x
  3. Step 3: Cross multiply
    618.73x = 854.03 × 397.69
  4. Step 4: Simplify right side
    618.73x = 339,639.19
  5. Step 5: Solve for x
    x = 339,639.19/618.73
  6. Step 6: Final answer
    x = 548.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.