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Finding the Fourth Proportional to 618.18, 853.38 and 356.15

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Solution

The fourth proportional to 618.18, 853.38 and 356.15 is: 491.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.18 : 853.38 = 356.15 : x
  2. Step 2: Convert to fraction form
    618.18/853.38 = 356.15/x
  3. Step 3: Cross multiply
    618.18x = 853.38 × 356.15
  4. Step 4: Simplify right side
    618.18x = 303,927.02
  5. Step 5: Solve for x
    x = 303,927.02/618.18
  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.