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Finding the Fourth Proportional to 377.21, 520.55 and 209.17

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Solution

The fourth proportional to 377.21, 520.55 and 209.17 is: 288.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    377.21 : 520.55 = 209.17 : x
  2. Step 2: Convert to fraction form
    377.21/520.55 = 209.17/x
  3. Step 3: Cross multiply
    377.21x = 520.55 × 209.17
  4. Step 4: Simplify right side
    377.21x = 108,883.44
  5. Step 5: Solve for x
    x = 108,883.44/377.21
  6. Step 6: Final answer
    x = 288.65

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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.