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Finding the Fourth Proportional to 187.40, 258.63 and 113.73

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Solution

The fourth proportional to 187.40, 258.63 and 113.73 is: 156.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.40 : 258.63 = 113.73 : x
  2. Step 2: Convert to fraction form
    187.40/258.63 = 113.73/x
  3. Step 3: Cross multiply
    187.40x = 258.63 × 113.73
  4. Step 4: Simplify right side
    187.40x = 29,413.99
  5. Step 5: Solve for x
    x = 29,413.99/187.40
  6. Step 6: Final answer
    x = 156.96

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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.