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Finding the Fourth Proportional to 258.68, 356.88 and 159.12

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Solution

The fourth proportional to 258.68, 356.88 and 159.12 is: 219.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.68 : 356.88 = 159.12 : x
  2. Step 2: Convert to fraction form
    258.68/356.88 = 159.12/x
  3. Step 3: Cross multiply
    258.68x = 356.88 × 159.12
  4. Step 4: Simplify right side
    258.68x = 56,786.75
  5. Step 5: Solve for x
    x = 56,786.75/258.68
  6. Step 6: Final answer
    x = 219.53

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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.