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Finding the Fourth Proportional to 187.91, 259.26 and 122.43

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Solution

The fourth proportional to 187.91, 259.26 and 122.43 is: 168.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.91 : 259.26 = 122.43 : x
  2. Step 2: Convert to fraction form
    187.91/259.26 = 122.43/x
  3. Step 3: Cross multiply
    187.91x = 259.26 × 122.43
  4. Step 4: Simplify right side
    187.91x = 31,741.20
  5. Step 5: Solve for x
    x = 31,741.20/187.91
  6. Step 6: Final answer
    x = 168.92

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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.