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Finding the Fourth Proportional to 300.65, 450.83 and 138.38

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Solution

The fourth proportional to 300.65, 450.83 and 138.38 is: 207.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    300.65 : 450.83 = 138.38 : x
  2. Step 2: Convert to fraction form
    300.65/450.83 = 138.38/x
  3. Step 3: Cross multiply
    300.65x = 450.83 × 138.38
  4. Step 4: Simplify right side
    300.65x = 62,383.95
  5. Step 5: Solve for x
    x = 62,383.95/300.65
  6. Step 6: Final answer
    x = 207.50

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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.