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Finding the Fourth Proportional to 639.62, 882.80 and 374.09

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Solution

The fourth proportional to 639.62, 882.80 and 374.09 is: 516.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.62 : 882.80 = 374.09 : x
  2. Step 2: Convert to fraction form
    639.62/882.80 = 374.09/x
  3. Step 3: Cross multiply
    639.62x = 882.80 × 374.09
  4. Step 4: Simplify right side
    639.62x = 330,246.65
  5. Step 5: Solve for x
    x = 330,246.65/639.62
  6. Step 6: Final answer
    x = 516.32

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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.