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Finding the Fourth Proportional to 374.87, 517.31 and 209.09

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Solution

The fourth proportional to 374.87, 517.31 and 209.09 is: 288.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.87 : 517.31 = 209.09 : x
  2. Step 2: Convert to fraction form
    374.87/517.31 = 209.09/x
  3. Step 3: Cross multiply
    374.87x = 517.31 × 209.09
  4. Step 4: Simplify right side
    374.87x = 108,162.28
  5. Step 5: Solve for x
    x = 108,162.28/374.87
  6. Step 6: Final answer
    x = 288.53

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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.