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Finding the Fourth Proportional to 374.20, 516.40 and 208.42

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Solution

The fourth proportional to 374.20, 516.40 and 208.42 is: 287.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.20 : 516.40 = 208.42 : x
  2. Step 2: Convert to fraction form
    374.20/516.40 = 208.42/x
  3. Step 3: Cross multiply
    374.20x = 516.40 × 208.42
  4. Step 4: Simplify right side
    374.20x = 107,628.09
  5. Step 5: Solve for x
    x = 107,628.09/374.20
  6. Step 6: Final answer
    x = 287.62

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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.