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Finding the Fourth Proportional to 414.37, 621.56 and 121.87

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Solution

The fourth proportional to 414.37, 621.56 and 121.87 is: 182.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.37 : 621.56 = 121.87 : x
  2. Step 2: Convert to fraction form
    414.37/621.56 = 121.87/x
  3. Step 3: Cross multiply
    414.37x = 621.56 × 121.87
  4. Step 4: Simplify right side
    414.37x = 75,749.52
  5. Step 5: Solve for x
    x = 75,749.52/414.37
  6. Step 6: Final answer
    x = 182.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.