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Finding the Fourth Proportional to 221.63, 305.70 and 166.28

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Solution

The fourth proportional to 221.63, 305.70 and 166.28 is: 229.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.63 : 305.70 = 166.28 : x
  2. Step 2: Convert to fraction form
    221.63/305.70 = 166.28/x
  3. Step 3: Cross multiply
    221.63x = 305.70 × 166.28
  4. Step 4: Simplify right side
    221.63x = 50,830.27
  5. Step 5: Solve for x
    x = 50,830.27/221.63
  6. Step 6: Final answer
    x = 229.35

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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.