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Finding the Fourth Proportional to 299.68, 449.12 and 137.28

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Solution

The fourth proportional to 299.68, 449.12 and 137.28 is: 205.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    299.68 : 449.12 = 137.28 : x
  2. Step 2: Convert to fraction form
    299.68/449.12 = 137.28/x
  3. Step 3: Cross multiply
    299.68x = 449.12 × 137.28
  4. Step 4: Simplify right side
    299.68x = 61,655.19
  5. Step 5: Solve for x
    x = 61,655.19/299.68
  6. Step 6: Final answer
    x = 205.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.