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Finding the Fourth Proportional to 221.72, 305.90 and 151.64

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Solution

The fourth proportional to 221.72, 305.90 and 151.64 is: 209.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.72 : 305.90 = 151.64 : x
  2. Step 2: Convert to fraction form
    221.72/305.90 = 151.64/x
  3. Step 3: Cross multiply
    221.72x = 305.90 × 151.64
  4. Step 4: Simplify right side
    221.72x = 46,386.68
  5. Step 5: Solve for x
    x = 46,386.68/221.72
  6. Step 6: Final answer
    x = 209.21

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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.