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Finding the Fourth Proportional to 449.71, 620.33 and 274.75

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Solution

The fourth proportional to 449.71, 620.33 and 274.75 is: 378.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.71 : 620.33 = 274.75 : x
  2. Step 2: Convert to fraction form
    449.71/620.33 = 274.75/x
  3. Step 3: Cross multiply
    449.71x = 620.33 × 274.75
  4. Step 4: Simplify right side
    449.71x = 170,435.67
  5. Step 5: Solve for x
    x = 170,435.67/449.71
  6. Step 6: Final answer
    x = 378.99

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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.