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Finding the Fourth Proportional to 187.85, 259.35 and 121.49

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Solution

The fourth proportional to 187.85, 259.35 and 121.49 is: 167.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.85 : 259.35 = 121.49 : x
  2. Step 2: Convert to fraction form
    187.85/259.35 = 121.49/x
  3. Step 3: Cross multiply
    187.85x = 259.35 × 121.49
  4. Step 4: Simplify right side
    187.85x = 31,508.43
  5. Step 5: Solve for x
    x = 31,508.43/187.85
  6. Step 6: Final answer
    x = 167.73

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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.