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Finding the Fourth Proportional to 221.87, 306.04 and 143.16

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Solution

The fourth proportional to 221.87, 306.04 and 143.16 is: 197.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.87 : 306.04 = 143.16 : x
  2. Step 2: Convert to fraction form
    221.87/306.04 = 143.16/x
  3. Step 3: Cross multiply
    221.87x = 306.04 × 143.16
  4. Step 4: Simplify right side
    221.87x = 43,812.69
  5. Step 5: Solve for x
    x = 43,812.69/221.87
  6. Step 6: Final answer
    x = 197.47

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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.