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Finding the Fourth Proportional to 221.52, 330.70 and 219.99

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Solution

The fourth proportional to 221.52, 330.70 and 219.99 is: 328.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.52 : 330.70 = 219.99 : x
  2. Step 2: Convert to fraction form
    221.52/330.70 = 219.99/x
  3. Step 3: Cross multiply
    221.52x = 330.70 × 219.99
  4. Step 4: Simplify right side
    221.52x = 72,750.14
  5. Step 5: Solve for x
    x = 72,750.14/221.52
  6. Step 6: Final answer
    x = 328.41

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.