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Finding the Fourth Proportional to 235.20, 326.40 and 225.60

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Solution

The fourth proportional to 235.20, 326.40 and 225.60 is: 313.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.20 : 326.40 = 225.60 : x
  2. Step 2: Convert to fraction form
    235.20/326.40 = 225.60/x
  3. Step 3: Cross multiply
    235.20x = 326.40 × 225.60
  4. Step 4: Simplify right side
    235.20x = 73,635.84
  5. Step 5: Solve for x
    x = 73,635.84/235.20
  6. Step 6: Final answer
    x = 313.08

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.