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Finding the Fourth Proportional to 314.21, 433.79 and 209.49

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Solution

The fourth proportional to 314.21, 433.79 and 209.49 is: 289.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    314.21 : 433.79 = 209.49 : x
  2. Step 2: Convert to fraction form
    314.21/433.79 = 209.49/x
  3. Step 3: Cross multiply
    314.21x = 433.79 × 209.49
  4. Step 4: Simplify right side
    314.21x = 90,872.78
  5. Step 5: Solve for x
    x = 90,872.78/314.21
  6. Step 6: Final answer
    x = 289.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.