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Finding the Fourth Proportional to 225.18, 312.60 and 218.49

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Solution

The fourth proportional to 225.18, 312.60 and 218.49 is: 303.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.18 : 312.60 = 218.49 : x
  2. Step 2: Convert to fraction form
    225.18/312.60 = 218.49/x
  3. Step 3: Cross multiply
    225.18x = 312.60 × 218.49
  4. Step 4: Simplify right side
    225.18x = 68,299.97
  5. Step 5: Solve for x
    x = 68,299.97/225.18
  6. Step 6: Final answer
    x = 303.31

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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.