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Finding the Fourth Proportional to 618.58, 853.36 and 397.45

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Solution

The fourth proportional to 618.58, 853.36 and 397.45 is: 548.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.58 : 853.36 = 397.45 : x
  2. Step 2: Convert to fraction form
    618.58/853.36 = 397.45/x
  3. Step 3: Cross multiply
    618.58x = 853.36 × 397.45
  4. Step 4: Simplify right side
    618.58x = 339,164.80
  5. Step 5: Solve for x
    x = 339,164.80/618.58
  6. Step 6: Final answer
    x = 548.30

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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.