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Finding the Fourth Proportional to 393.88, 590.88 and 133.92

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Solution

The fourth proportional to 393.88, 590.88 and 133.92 is: 200.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.88 : 590.88 = 133.92 : x
  2. Step 2: Convert to fraction form
    393.88/590.88 = 133.92/x
  3. Step 3: Cross multiply
    393.88x = 590.88 × 133.92
  4. Step 4: Simplify right side
    393.88x = 79,130.65
  5. Step 5: Solve for x
    x = 79,130.65/393.88
  6. Step 6: Final answer
    x = 200.90

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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.