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Finding the Fourth Proportional to 636.20, 955.67 and 538.90

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Solution

The fourth proportional to 636.20, 955.67 and 538.90 is: 809.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.20 : 955.67 = 538.90 : x
  2. Step 2: Convert to fraction form
    636.20/955.67 = 538.90/x
  3. Step 3: Cross multiply
    636.20x = 955.67 × 538.90
  4. Step 4: Simplify right side
    636.20x = 515,010.56
  5. Step 5: Solve for x
    x = 515,010.56/636.20
  6. Step 6: Final answer
    x = 809.51

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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.