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Finding the Fourth Proportional to 449.39, 620.21 and 274.85

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Solution

The fourth proportional to 449.39, 620.21 and 274.85 is: 379.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.39 : 620.21 = 274.85 : x
  2. Step 2: Convert to fraction form
    449.39/620.21 = 274.85/x
  3. Step 3: Cross multiply
    449.39x = 620.21 × 274.85
  4. Step 4: Simplify right side
    449.39x = 170,463.34
  5. Step 5: Solve for x
    x = 170,463.34/449.39
  6. Step 6: Final answer
    x = 379.32

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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.