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Finding the Fourth Proportional to 393.86, 590.61 and 133.80

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Solution

The fourth proportional to 393.86, 590.61 and 133.80 is: 200.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.86 : 590.61 = 133.80 : x
  2. Step 2: Convert to fraction form
    393.86/590.61 = 133.80/x
  3. Step 3: Cross multiply
    393.86x = 590.61 × 133.80
  4. Step 4: Simplify right side
    393.86x = 79,023.62
  5. Step 5: Solve for x
    x = 79,023.62/393.86
  6. Step 6: Final answer
    x = 200.64

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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.