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Finding the Fourth Proportional to 187.71, 258.91 and 113.94

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Solution

The fourth proportional to 187.71, 258.91 and 113.94 is: 157.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.71 : 258.91 = 113.94 : x
  2. Step 2: Convert to fraction form
    187.71/258.91 = 113.94/x
  3. Step 3: Cross multiply
    187.71x = 258.91 × 113.94
  4. Step 4: Simplify right side
    187.71x = 29,500.21
  5. Step 5: Solve for x
    x = 29,500.21/187.71
  6. Step 6: Final answer
    x = 157.16

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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.