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Finding the Fourth Proportional to 449.25, 620.10 and 274.56

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Solution

The fourth proportional to 449.25, 620.10 and 274.56 is: 378.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.25 : 620.10 = 274.56 : x
  2. Step 2: Convert to fraction form
    449.25/620.10 = 274.56/x
  3. Step 3: Cross multiply
    449.25x = 620.10 × 274.56
  4. Step 4: Simplify right side
    449.25x = 170,254.66
  5. Step 5: Solve for x
    x = 170,254.66/449.25
  6. Step 6: Final answer
    x = 378.98

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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.