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Finding the Fourth Proportional to 374.99, 517.46 and 209.21

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Solution

The fourth proportional to 374.99, 517.46 and 209.21 is: 288.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.99 : 517.46 = 209.21 : x
  2. Step 2: Convert to fraction form
    374.99/517.46 = 209.21/x
  3. Step 3: Cross multiply
    374.99x = 517.46 × 209.21
  4. Step 4: Simplify right side
    374.99x = 108,258.05
  5. Step 5: Solve for x
    x = 108,258.05/374.99
  6. Step 6: Final answer
    x = 288.69

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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.