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Finding the Fourth Proportional to 187.92, 258.80 and 187.31

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Solution

The fourth proportional to 187.92, 258.80 and 187.31 is: 257.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.92 : 258.80 = 187.31 : x
  2. Step 2: Convert to fraction form
    187.92/258.80 = 187.31/x
  3. Step 3: Cross multiply
    187.92x = 258.80 × 187.31
  4. Step 4: Simplify right side
    187.92x = 48,475.54
  5. Step 5: Solve for x
    x = 48,475.54/187.92
  6. Step 6: Final answer
    x = 257.96

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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.