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Finding the Fourth Proportional to 258.11, 356.21 and 159.81

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Solution

The fourth proportional to 258.11, 356.21 and 159.81 is: 220.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.11 : 356.21 = 159.81 : x
  2. Step 2: Convert to fraction form
    258.11/356.21 = 159.81/x
  3. Step 3: Cross multiply
    258.11x = 356.21 × 159.81
  4. Step 4: Simplify right side
    258.11x = 56,925.12
  5. Step 5: Solve for x
    x = 56,925.12/258.11
  6. Step 6: Final answer
    x = 220.55

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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.