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Finding the Fourth Proportional to 299.72, 448.79 and 212.58

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Solution

The fourth proportional to 299.72, 448.79 and 212.58 is: 318.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    299.72 : 448.79 = 212.58 : x
  2. Step 2: Convert to fraction form
    299.72/448.79 = 212.58/x
  3. Step 3: Cross multiply
    299.72x = 448.79 × 212.58
  4. Step 4: Simplify right side
    299.72x = 95,402.72
  5. Step 5: Solve for x
    x = 95,402.72/299.72
  6. Step 6: Final answer
    x = 318.31

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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.