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Finding the Fourth Proportional to 125.22, 186.80 and 121.87

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Solution

The fourth proportional to 125.22, 186.80 and 121.87 is: 181.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.22 : 186.80 = 121.87 : x
  2. Step 2: Convert to fraction form
    125.22/186.80 = 121.87/x
  3. Step 3: Cross multiply
    125.22x = 186.80 × 121.87
  4. Step 4: Simplify right side
    125.22x = 22,765.32
  5. Step 5: Solve for x
    x = 22,765.32/125.22
  6. Step 6: Final answer
    x = 181.80

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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.