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Finding the Fourth Proportional to 618.85, 853.99 and 356.86

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Solution

The fourth proportional to 618.85, 853.99 and 356.86 is: 492.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.85 : 853.99 = 356.86 : x
  2. Step 2: Convert to fraction form
    618.85/853.99 = 356.86/x
  3. Step 3: Cross multiply
    618.85x = 853.99 × 356.86
  4. Step 4: Simplify right side
    618.85x = 304,754.87
  5. Step 5: Solve for x
    x = 304,754.87/618.85
  6. Step 6: Final answer
    x = 492.45

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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.