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Finding the Fourth Proportional to 449.69, 620.53 and 253.21

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Solution

The fourth proportional to 449.69, 620.53 and 253.21 is: 349.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    449.69 : 620.53 = 253.21 : x
  2. Step 2: Convert to fraction form
    449.69/620.53 = 253.21/x
  3. Step 3: Cross multiply
    449.69x = 620.53 × 253.21
  4. Step 4: Simplify right side
    449.69x = 157,123.38
  5. Step 5: Solve for x
    x = 157,123.38/449.69
  6. Step 6: Final answer
    x = 349.41

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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.