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Finding the Fourth Proportional to 636.60, 955.80 and 393.60

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Solution

The fourth proportional to 636.60, 955.80 and 393.60 is: 590.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.60 : 955.80 = 393.60 : x
  2. Step 2: Convert to fraction form
    636.60/955.80 = 393.60/x
  3. Step 3: Cross multiply
    636.60x = 955.80 × 393.60
  4. Step 4: Simplify right side
    636.60x = 376,202.88
  5. Step 5: Solve for x
    x = 376,202.88/636.60
  6. Step 6: Final answer
    x = 590.96

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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.