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Finding the Fourth Proportional to 258.38, 387.74 and 190.06

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Solution

The fourth proportional to 258.38, 387.74 and 190.06 is: 285.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.38 : 387.74 = 190.06 : x
  2. Step 2: Convert to fraction form
    258.38/387.74 = 190.06/x
  3. Step 3: Cross multiply
    258.38x = 387.74 × 190.06
  4. Step 4: Simplify right side
    258.38x = 73,694.07
  5. Step 5: Solve for x
    x = 73,694.07/258.38
  6. Step 6: Final answer
    x = 285.22

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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.