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Finding the Fourth Proportional to 449.92, 620.86 and 253.42

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Solution

The fourth proportional to 449.92, 620.86 and 253.42 is: 349.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.92 : 620.86 = 253.42 : x
  2. Step 2: Convert to fraction form
    449.92/620.86 = 253.42/x
  3. Step 3: Cross multiply
    449.92x = 620.86 × 253.42
  4. Step 4: Simplify right side
    449.92x = 157,338.34
  5. Step 5: Solve for x
    x = 157,338.34/449.92
  6. Step 6: Final answer
    x = 349.70

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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.