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Finding the Fourth Proportional to 221.29, 305.43 and 151.46

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Solution

The fourth proportional to 221.29, 305.43 and 151.46 is: 209.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.29 : 305.43 = 151.46 : x
  2. Step 2: Convert to fraction form
    221.29/305.43 = 151.46/x
  3. Step 3: Cross multiply
    221.29x = 305.43 × 151.46
  4. Step 4: Simplify right side
    221.29x = 46,260.43
  5. Step 5: Solve for x
    x = 46,260.43/221.29
  6. Step 6: Final answer
    x = 209.05

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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.