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Finding the Fourth Proportional to 393.89, 590.02 and 198.61

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Solution

The fourth proportional to 393.89, 590.02 and 198.61 is: 297.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.89 : 590.02 = 198.61 : x
  2. Step 2: Convert to fraction form
    393.89/590.02 = 198.61/x
  3. Step 3: Cross multiply
    393.89x = 590.02 × 198.61
  4. Step 4: Simplify right side
    393.89x = 117,187.52
  5. Step 5: Solve for x
    x = 117,187.52/393.89
  6. Step 6: Final answer
    x = 297.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.