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Finding the Fourth Proportional to 220.99, 304.35 and 216.21

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Solution

The fourth proportional to 220.99, 304.35 and 216.21 is: 297.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.99 : 304.35 = 216.21 : x
  2. Step 2: Convert to fraction form
    220.99/304.35 = 216.21/x
  3. Step 3: Cross multiply
    220.99x = 304.35 × 216.21
  4. Step 4: Simplify right side
    220.99x = 65,801.56
  5. Step 5: Solve for x
    x = 65,801.56/220.99
  6. Step 6: Final answer
    x = 297.76

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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.