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Finding the Fourth Proportional to 258.49, 387.53 and 119.58

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Solution

The fourth proportional to 258.49, 387.53 and 119.58 is: 179.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.49 : 387.53 = 119.58 : x
  2. Step 2: Convert to fraction form
    258.49/387.53 = 119.58/x
  3. Step 3: Cross multiply
    258.49x = 387.53 × 119.58
  4. Step 4: Simplify right side
    258.49x = 46,340.84
  5. Step 5: Solve for x
    x = 46,340.84/258.49
  6. Step 6: Final answer
    x = 179.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.