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Finding the Fourth Proportional to 618.18, 853.30 and 356.28

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Solution

The fourth proportional to 618.18, 853.30 and 356.28 is: 491.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.18 : 853.30 = 356.28 : x
  2. Step 2: Convert to fraction form
    618.18/853.30 = 356.28/x
  3. Step 3: Cross multiply
    618.18x = 853.30 × 356.28
  4. Step 4: Simplify right side
    618.18x = 304,013.72
  5. Step 5: Solve for x
    x = 304,013.72/618.18
  6. Step 6: Final answer
    x = 491.79

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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.