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Finding the Fourth Proportional to 338.13, 507.21 and 221.25

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Solution

The fourth proportional to 338.13, 507.21 and 221.25 is: 331.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.13 : 507.21 = 221.25 : x
  2. Step 2: Convert to fraction form
    338.13/507.21 = 221.25/x
  3. Step 3: Cross multiply
    338.13x = 507.21 × 221.25
  4. Step 4: Simplify right side
    338.13x = 112,220.21
  5. Step 5: Solve for x
    x = 112,220.21/338.13
  6. Step 6: Final answer
    x = 331.88

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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.