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Finding the Fourth Proportional to 449.60, 620.22 and 309.48

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Solution

The fourth proportional to 449.60, 620.22 and 309.48 is: 426.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.60 : 620.22 = 309.48 : x
  2. Step 2: Convert to fraction form
    449.60/620.22 = 309.48/x
  3. Step 3: Cross multiply
    449.60x = 620.22 × 309.48
  4. Step 4: Simplify right side
    449.60x = 191,945.69
  5. Step 5: Solve for x
    x = 191,945.69/449.60
  6. Step 6: Final answer
    x = 426.93

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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.