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Finding the Fourth Proportional to 125.40, 186.81 and 121.62

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Solution

The fourth proportional to 125.40, 186.81 and 121.62 is: 181.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.40 : 186.81 = 121.62 : x
  2. Step 2: Convert to fraction form
    125.40/186.81 = 121.62/x
  3. Step 3: Cross multiply
    125.40x = 186.81 × 121.62
  4. Step 4: Simplify right side
    125.40x = 22,719.83
  5. Step 5: Solve for x
    x = 22,719.83/125.40
  6. Step 6: Final answer
    x = 181.18

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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.