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Finding the Fourth Proportional to 300.79, 451.11 and 138.31

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Solution

The fourth proportional to 300.79, 451.11 and 138.31 is: 207.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    300.79 : 451.11 = 138.31 : x
  2. Step 2: Convert to fraction form
    300.79/451.11 = 138.31/x
  3. Step 3: Cross multiply
    300.79x = 451.11 × 138.31
  4. Step 4: Simplify right side
    300.79x = 62,393.02
  5. Step 5: Solve for x
    x = 62,393.02/300.79
  6. Step 6: Final answer
    x = 207.43

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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.