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Finding the Fourth Proportional to 414.21, 621.51 and 208.80

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Solution

The fourth proportional to 414.21, 621.51 and 208.80 is: 313.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.21 : 621.51 = 208.80 : x
  2. Step 2: Convert to fraction form
    414.21/621.51 = 208.80/x
  3. Step 3: Cross multiply
    414.21x = 621.51 × 208.80
  4. Step 4: Simplify right side
    414.21x = 129,771.29
  5. Step 5: Solve for x
    x = 129,771.29/414.21
  6. Step 6: Final answer
    x = 313.30

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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.