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Finding the Fourth Proportional to 393.40, 589.20 and 200.80

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Solution

The fourth proportional to 393.40, 589.20 and 200.80 is: 300.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.40 : 589.20 = 200.80 : x
  2. Step 2: Convert to fraction form
    393.40/589.20 = 200.80/x
  3. Step 3: Cross multiply
    393.40x = 589.20 × 200.80
  4. Step 4: Simplify right side
    393.40x = 118,311.36
  5. Step 5: Solve for x
    x = 118,311.36/393.40
  6. Step 6: Final answer
    x = 300.74

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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.