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Finding the Fourth Proportional to 225.18, 308.72 and 221.07

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Solution

The fourth proportional to 225.18, 308.72 and 221.07 is: 303.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.18 : 308.72 = 221.07 : x
  2. Step 2: Convert to fraction form
    225.18/308.72 = 221.07/x
  3. Step 3: Cross multiply
    225.18x = 308.72 × 221.07
  4. Step 4: Simplify right side
    225.18x = 68,249.28
  5. Step 5: Solve for x
    x = 68,249.28/225.18
  6. Step 6: Final answer
    x = 303.09

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.