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Finding the Fourth Proportional to 393.52, 590.40 and 220.12

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Solution

The fourth proportional to 393.52, 590.40 and 220.12 is: 330.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.52 : 590.40 = 220.12 : x
  2. Step 2: Convert to fraction form
    393.52/590.40 = 220.12/x
  3. Step 3: Cross multiply
    393.52x = 590.40 × 220.12
  4. Step 4: Simplify right side
    393.52x = 129,958.85
  5. Step 5: Solve for x
    x = 129,958.85/393.52
  6. Step 6: Final answer
    x = 330.25

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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.