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Finding the Fourth Proportional to 618.78, 854 and 356.79

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Solution

The fourth proportional to 618.78, 854 and 356.79 is: 492.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.78 : 854 = 356.79 : x
  2. Step 2: Convert to fraction form
    618.78/854 = 356.79/x
  3. Step 3: Cross multiply
    618.78x = 854 × 356.79
  4. Step 4: Simplify right side
    618.78x = 304,698.66
  5. Step 5: Solve for x
    x = 304,698.66/618.78
  6. Step 6: Final answer
    x = 492.42

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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.