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Finding the Fourth Proportional to 225.20, 339.40 and 212.64

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Solution

The fourth proportional to 225.20, 339.40 and 212.64 is: 320.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.20 : 339.40 = 212.64 : x
  2. Step 2: Convert to fraction form
    225.20/339.40 = 212.64/x
  3. Step 3: Cross multiply
    225.20x = 339.40 × 212.64
  4. Step 4: Simplify right side
    225.20x = 72,168.32
  5. Step 5: Solve for x
    x = 72,168.32/225.20
  6. Step 6: Final answer
    x = 320.47

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.