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Finding the Fourth Proportional to 618.45, 853.11 and 356.42

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Solution

The fourth proportional to 618.45, 853.11 and 356.42 is: 491.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.45 : 853.11 = 356.42 : x
  2. Step 2: Convert to fraction form
    618.45/853.11 = 356.42/x
  3. Step 3: Cross multiply
    618.45x = 853.11 × 356.42
  4. Step 4: Simplify right side
    618.45x = 304,061.20
  5. Step 5: Solve for x
    x = 304,061.20/618.45
  6. Step 6: Final answer
    x = 491.65

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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.