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Finding the Fourth Proportional to 300.79, 451.19 and 138.59

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Solution

The fourth proportional to 300.79, 451.19 and 138.59 is: 207.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    300.79 : 451.19 = 138.59 : x
  2. Step 2: Convert to fraction form
    300.79/451.19 = 138.59/x
  3. Step 3: Cross multiply
    300.79x = 451.19 × 138.59
  4. Step 4: Simplify right side
    300.79x = 62,530.42
  5. Step 5: Solve for x
    x = 62,530.42/300.79
  6. Step 6: Final answer
    x = 207.89

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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.