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Finding the Fourth Proportional to 449.91, 620.91 and 275.25

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Solution

The fourth proportional to 449.91, 620.91 and 275.25 is: 379.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.91 : 620.91 = 275.25 : x
  2. Step 2: Convert to fraction form
    449.91/620.91 = 275.25/x
  3. Step 3: Cross multiply
    449.91x = 620.91 × 275.25
  4. Step 4: Simplify right side
    449.91x = 170,905.48
  5. Step 5: Solve for x
    x = 170,905.48/449.91
  6. Step 6: Final answer
    x = 379.87

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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.