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Finding the Fourth Proportional to 221.02, 330.89 and 143.76

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Solution

The fourth proportional to 221.02, 330.89 and 143.76 is: 215.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.02 : 330.89 = 143.76 : x
  2. Step 2: Convert to fraction form
    221.02/330.89 = 143.76/x
  3. Step 3: Cross multiply
    221.02x = 330.89 × 143.76
  4. Step 4: Simplify right side
    221.02x = 47,568.75
  5. Step 5: Solve for x
    x = 47,568.75/221.02
  6. Step 6: Final answer
    x = 215.22

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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.