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Finding the Fourth Proportional to 449.20, 619.90 and 274.55

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Solution

The fourth proportional to 449.20, 619.90 and 274.55 is: 378.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.20 : 619.90 = 274.55 : x
  2. Step 2: Convert to fraction form
    449.20/619.90 = 274.55/x
  3. Step 3: Cross multiply
    449.20x = 619.90 × 274.55
  4. Step 4: Simplify right side
    449.20x = 170,190.45
  5. Step 5: Solve for x
    x = 170,190.45/449.20
  6. Step 6: Final answer
    x = 378.87

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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.