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Finding the Fourth Proportional to 449.13, 619.79 and 274.47

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Solution

The fourth proportional to 449.13, 619.79 and 274.47 is: 378.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.13 : 619.79 = 274.47 : x
  2. Step 2: Convert to fraction form
    449.13/619.79 = 274.47/x
  3. Step 3: Cross multiply
    449.13x = 619.79 × 274.47
  4. Step 4: Simplify right side
    449.13x = 170,113.55
  5. Step 5: Solve for x
    x = 170,113.55/449.13
  6. Step 6: Final answer
    x = 378.76

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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.