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Finding the Fourth Proportional to 258.55, 356.61 and 165.22

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Solution

The fourth proportional to 258.55, 356.61 and 165.22 is: 227.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.55 : 356.61 = 165.22 : x
  2. Step 2: Convert to fraction form
    258.55/356.61 = 165.22/x
  3. Step 3: Cross multiply
    258.55x = 356.61 × 165.22
  4. Step 4: Simplify right side
    258.55x = 58,919.10
  5. Step 5: Solve for x
    x = 58,919.10/258.55
  6. Step 6: Final answer
    x = 227.88

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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.