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Finding the Fourth Proportional to 414.36, 620.86 and 208.72

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Solution

The fourth proportional to 414.36, 620.86 and 208.72 is: 312.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.36 : 620.86 = 208.72 : x
  2. Step 2: Convert to fraction form
    414.36/620.86 = 208.72/x
  3. Step 3: Cross multiply
    414.36x = 620.86 × 208.72
  4. Step 4: Simplify right side
    414.36x = 129,585.90
  5. Step 5: Solve for x
    x = 129,585.90/414.36
  6. Step 6: Final answer
    x = 312.74

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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.