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Finding the Fourth Proportional to 300.61, 451.05 and 138.43

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Solution

The fourth proportional to 300.61, 451.05 and 138.43 is: 207.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    300.61 : 451.05 = 138.43 : x
  2. Step 2: Convert to fraction form
    300.61/451.05 = 138.43/x
  3. Step 3: Cross multiply
    300.61x = 451.05 × 138.43
  4. Step 4: Simplify right side
    300.61x = 62,438.85
  5. Step 5: Solve for x
    x = 62,438.85/300.61
  6. Step 6: Final answer
    x = 207.71

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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.