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Finding the Fourth Proportional to 225.28, 336.44 and 212.80

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Solution

The fourth proportional to 225.28, 336.44 and 212.80 is: 317.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.28 : 336.44 = 212.80 : x
  2. Step 2: Convert to fraction form
    225.28/336.44 = 212.80/x
  3. Step 3: Cross multiply
    225.28x = 336.44 × 212.80
  4. Step 4: Simplify right side
    225.28x = 71,594.43
  5. Step 5: Solve for x
    x = 71,594.43/225.28
  6. Step 6: Final answer
    x = 317.80

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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.