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Finding the Fourth Proportional to 230.40, 343.60 and 220.80

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Solution

The fourth proportional to 230.40, 343.60 and 220.80 is: 329.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.40 : 343.60 = 220.80 : x
  2. Step 2: Convert to fraction form
    230.40/343.60 = 220.80/x
  3. Step 3: Cross multiply
    230.40x = 343.60 × 220.80
  4. Step 4: Simplify right side
    230.40x = 75,866.88
  5. Step 5: Solve for x
    x = 75,866.88/230.40
  6. Step 6: Final answer
    x = 329.28

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.