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Finding the Fourth Proportional to 369.21, 509.43 and 221.88

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Solution

The fourth proportional to 369.21, 509.43 and 221.88 is: 306.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    369.21 : 509.43 = 221.88 : x
  2. Step 2: Convert to fraction form
    369.21/509.43 = 221.88/x
  3. Step 3: Cross multiply
    369.21x = 509.43 × 221.88
  4. Step 4: Simplify right side
    369.21x = 113,032.33
  5. Step 5: Solve for x
    x = 113,032.33/369.21
  6. Step 6: Final answer
    x = 306.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.