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Finding the Fourth Proportional to 419.39, 630.44 and 406.43

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Solution

The fourth proportional to 419.39, 630.44 and 406.43 is: 610.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.39 : 630.44 = 406.43 : x
  2. Step 2: Convert to fraction form
    419.39/630.44 = 406.43/x
  3. Step 3: Cross multiply
    419.39x = 630.44 × 406.43
  4. Step 4: Simplify right side
    419.39x = 256,227.70
  5. Step 5: Solve for x
    x = 256,227.70/419.39
  6. Step 6: Final answer
    x = 610.95

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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.