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Finding the Fourth Proportional to 225.21, 336.84 and 208.81

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Solution

The fourth proportional to 225.21, 336.84 and 208.81 is: 312.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.21 : 336.84 = 208.81 : x
  2. Step 2: Convert to fraction form
    225.21/336.84 = 208.81/x
  3. Step 3: Cross multiply
    225.21x = 336.84 × 208.81
  4. Step 4: Simplify right side
    225.21x = 70,335.56
  5. Step 5: Solve for x
    x = 70,335.56/225.21
  6. Step 6: Final answer
    x = 312.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.