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Finding the Fourth Proportional to 297.05, 445.43 and 142.85

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Solution

The fourth proportional to 297.05, 445.43 and 142.85 is: 214.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    297.05 : 445.43 = 142.85 : x
  2. Step 2: Convert to fraction form
    297.05/445.43 = 142.85/x
  3. Step 3: Cross multiply
    297.05x = 445.43 × 142.85
  4. Step 4: Simplify right side
    297.05x = 63,631.15
  5. Step 5: Solve for x
    x = 63,631.15/297.05
  6. Step 6: Final answer
    x = 214.21

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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.