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Finding the Fourth Proportional to 618.91, 853.96 and 356.83

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Solution

The fourth proportional to 618.91, 853.96 and 356.83 is: 492.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.91 : 853.96 = 356.83 : x
  2. Step 2: Convert to fraction form
    618.91/853.96 = 356.83/x
  3. Step 3: Cross multiply
    618.91x = 853.96 × 356.83
  4. Step 4: Simplify right side
    618.91x = 304,718.55
  5. Step 5: Solve for x
    x = 304,718.55/618.91
  6. Step 6: Final answer
    x = 492.35

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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.