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Finding the Fourth Proportional to 414.14, 621.46 and 208.84

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Solution

The fourth proportional to 414.14, 621.46 and 208.84 is: 313.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.14 : 621.46 = 208.84 : x
  2. Step 2: Convert to fraction form
    414.14/621.46 = 208.84/x
  3. Step 3: Cross multiply
    414.14x = 621.46 × 208.84
  4. Step 4: Simplify right side
    414.14x = 129,785.71
  5. Step 5: Solve for x
    x = 129,785.71/414.14
  6. Step 6: Final answer
    x = 313.39

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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.