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Finding the Fourth Proportional to 414.84, 622.20 and 209.28

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Solution

The fourth proportional to 414.84, 622.20 and 209.28 is: 313.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.84 : 622.20 = 209.28 : x
  2. Step 2: Convert to fraction form
    414.84/622.20 = 209.28/x
  3. Step 3: Cross multiply
    414.84x = 622.20 × 209.28
  4. Step 4: Simplify right side
    414.84x = 130,214.02
  5. Step 5: Solve for x
    x = 130,214.02/414.84
  6. Step 6: Final answer
    x = 313.89

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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.