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Finding the Fourth Proportional to 265.11, 365.90 and 221.43

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Solution

The fourth proportional to 265.11, 365.90 and 221.43 is: 305.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.11 : 365.90 = 221.43 : x
  2. Step 2: Convert to fraction form
    265.11/365.90 = 221.43/x
  3. Step 3: Cross multiply
    265.11x = 365.90 × 221.43
  4. Step 4: Simplify right side
    265.11x = 81,020.13
  5. Step 5: Solve for x
    x = 81,020.13/265.11
  6. Step 6: Final answer
    x = 305.61

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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.