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Finding the Fourth Proportional to 449.79, 620.82 and 275.28

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Solution

The fourth proportional to 449.79, 620.82 and 275.28 is: 379.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.79 : 620.82 = 275.28 : x
  2. Step 2: Convert to fraction form
    449.79/620.82 = 275.28/x
  3. Step 3: Cross multiply
    449.79x = 620.82 × 275.28
  4. Step 4: Simplify right side
    449.79x = 170,899.33
  5. Step 5: Solve for x
    x = 170,899.33/449.79
  6. Step 6: Final answer
    x = 379.95

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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.