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Finding the Fourth Proportional to 449.70, 620.43 and 253.22

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Solution

The fourth proportional to 449.70, 620.43 and 253.22 is: 349.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.70 : 620.43 = 253.22 : x
  2. Step 2: Convert to fraction form
    449.70/620.43 = 253.22/x
  3. Step 3: Cross multiply
    449.70x = 620.43 × 253.22
  4. Step 4: Simplify right side
    449.70x = 157,102.18
  5. Step 5: Solve for x
    x = 157,102.18/449.70
  6. Step 6: Final answer
    x = 349.35

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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.