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Finding the Fourth Proportional to 125.28, 186.75 and 121.68

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Solution

The fourth proportional to 125.28, 186.75 and 121.68 is: 181.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.28 : 186.75 = 121.68 : x
  2. Step 2: Convert to fraction form
    125.28/186.75 = 121.68/x
  3. Step 3: Cross multiply
    125.28x = 186.75 × 121.68
  4. Step 4: Simplify right side
    125.28x = 22,723.74
  5. Step 5: Solve for x
    x = 22,723.74/125.28
  6. Step 6: Final answer
    x = 181.38

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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.