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Finding the Fourth Proportional to 187.86, 259.26 and 122.31

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Solution

The fourth proportional to 187.86, 259.26 and 122.31 is: 168.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.86 : 259.26 = 122.31 : x
  2. Step 2: Convert to fraction form
    187.86/259.26 = 122.31/x
  3. Step 3: Cross multiply
    187.86x = 259.26 × 122.31
  4. Step 4: Simplify right side
    187.86x = 31,710.09
  5. Step 5: Solve for x
    x = 31,710.09/187.86
  6. Step 6: Final answer
    x = 168.80

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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.