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Finding the Fourth Proportional to 618.67, 853.22 and 397.54

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Solution

The fourth proportional to 618.67, 853.22 and 397.54 is: 548.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.67 : 853.22 = 397.54 : x
  2. Step 2: Convert to fraction form
    618.67/853.22 = 397.54/x
  3. Step 3: Cross multiply
    618.67x = 853.22 × 397.54
  4. Step 4: Simplify right side
    618.67x = 339,182.83
  5. Step 5: Solve for x
    x = 339,182.83/618.67
  6. Step 6: Final answer
    x = 548.25

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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.