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Finding the Fourth Proportional to 393.25, 589.43 and 220

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Solution

The fourth proportional to 393.25, 589.43 and 220 is: 329.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.25 : 589.43 = 220 : x
  2. Step 2: Convert to fraction form
    393.25/589.43 = 220/x
  3. Step 3: Cross multiply
    393.25x = 589.43 × 220
  4. Step 4: Simplify right side
    393.25x = 129,674.60
  5. Step 5: Solve for x
    x = 129,674.60/393.25
  6. Step 6: Final answer
    x = 329.75

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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.