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Finding the Fourth Proportional to 187.98, 259.41 and 122.61

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Solution

The fourth proportional to 187.98, 259.41 and 122.61 is: 169.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.98 : 259.41 = 122.61 : x
  2. Step 2: Convert to fraction form
    187.98/259.41 = 122.61/x
  3. Step 3: Cross multiply
    187.98x = 259.41 × 122.61
  4. Step 4: Simplify right side
    187.98x = 31,806.26
  5. Step 5: Solve for x
    x = 31,806.26/187.98
  6. Step 6: Final answer
    x = 169.20

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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.