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Finding the Fourth Proportional to 374.92, 517.38 and 209.15

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Solution

The fourth proportional to 374.92, 517.38 and 209.15 is: 288.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.92 : 517.38 = 209.15 : x
  2. Step 2: Convert to fraction form
    374.92/517.38 = 209.15/x
  3. Step 3: Cross multiply
    374.92x = 517.38 × 209.15
  4. Step 4: Simplify right side
    374.92x = 108,210.03
  5. Step 5: Solve for x
    x = 108,210.03/374.92
  6. Step 6: Final answer
    x = 288.62

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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.