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Finding the Fourth Proportional to 125.25, 186.60 and 121.67

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Solution

The fourth proportional to 125.25, 186.60 and 121.67 is: 181.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.25 : 186.60 = 121.67 : x
  2. Step 2: Convert to fraction form
    125.25/186.60 = 121.67/x
  3. Step 3: Cross multiply
    125.25x = 186.60 × 121.67
  4. Step 4: Simplify right side
    125.25x = 22,703.85
  5. Step 5: Solve for x
    x = 22,703.85/125.25
  6. Step 6: Final answer
    x = 181.27

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.