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Finding the Fourth Proportional to 187.08, 258.29 and 121.67

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Solution

The fourth proportional to 187.08, 258.29 and 121.67 is: 167.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.08 : 258.29 = 121.67 : x
  2. Step 2: Convert to fraction form
    187.08/258.29 = 121.67/x
  3. Step 3: Cross multiply
    187.08x = 258.29 × 121.67
  4. Step 4: Simplify right side
    187.08x = 31,424.24
  5. Step 5: Solve for x
    x = 31,424.24/187.08
  6. Step 6: Final answer
    x = 167.97

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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.