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Finding the Fourth Proportional to 636.41, 955.20 and 420.14

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Solution

The fourth proportional to 636.41, 955.20 and 420.14 is: 630.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.41 : 955.20 = 420.14 : x
  2. Step 2: Convert to fraction form
    636.41/955.20 = 420.14/x
  3. Step 3: Cross multiply
    636.41x = 955.20 × 420.14
  4. Step 4: Simplify right side
    636.41x = 401,317.73
  5. Step 5: Solve for x
    x = 401,317.73/636.41
  6. Step 6: Final answer
    x = 630.60

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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.