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Finding the Fourth Proportional to 449.49, 621.44 and 394.80

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Solution

The fourth proportional to 449.49, 621.44 and 394.80 is: 545.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.49 : 621.44 = 394.80 : x
  2. Step 2: Convert to fraction form
    449.49/621.44 = 394.80/x
  3. Step 3: Cross multiply
    449.49x = 621.44 × 394.80
  4. Step 4: Simplify right side
    449.49x = 245,344.51
  5. Step 5: Solve for x
    x = 245,344.51/449.49
  6. Step 6: Final answer
    x = 545.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.