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Finding the Fourth Proportional to 258.56, 389.37 and 186.92

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Solution

The fourth proportional to 258.56, 389.37 and 186.92 is: 281.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.56 : 389.37 = 186.92 : x
  2. Step 2: Convert to fraction form
    258.56/389.37 = 186.92/x
  3. Step 3: Cross multiply
    258.56x = 389.37 × 186.92
  4. Step 4: Simplify right side
    258.56x = 72,781.04
  5. Step 5: Solve for x
    x = 72,781.04/258.56
  6. Step 6: Final answer
    x = 281.49

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.