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Finding the Fourth Proportional to 422.76, 635.49 and 392.70

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Solution

The fourth proportional to 422.76, 635.49 and 392.70 is: 590.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.76 : 635.49 = 392.70 : x
  2. Step 2: Convert to fraction form
    422.76/635.49 = 392.70/x
  3. Step 3: Cross multiply
    422.76x = 635.49 × 392.70
  4. Step 4: Simplify right side
    422.76x = 249,556.92
  5. Step 5: Solve for x
    x = 249,556.92/422.76
  6. Step 6: Final answer
    x = 590.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.