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Finding the Fourth Proportional to 299.20, 448.50 and 136.80

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Solution

The fourth proportional to 299.20, 448.50 and 136.80 is: 205.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    299.20 : 448.50 = 136.80 : x
  2. Step 2: Convert to fraction form
    299.20/448.50 = 136.80/x
  3. Step 3: Cross multiply
    299.20x = 448.50 × 136.80
  4. Step 4: Simplify right side
    299.20x = 61,354.80
  5. Step 5: Solve for x
    x = 61,354.80/299.20
  6. Step 6: Final answer
    x = 205.06

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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.