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Finding the Fourth Proportional to 618.39, 853.41 and 369.66

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Solution

The fourth proportional to 618.39, 853.41 and 369.66 is: 510.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.39 : 853.41 = 369.66 : x
  2. Step 2: Convert to fraction form
    618.39/853.41 = 369.66/x
  3. Step 3: Cross multiply
    618.39x = 853.41 × 369.66
  4. Step 4: Simplify right side
    618.39x = 315,471.54
  5. Step 5: Solve for x
    x = 315,471.54/618.39
  6. Step 6: Final answer
    x = 510.15

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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.