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Finding the Fourth Proportional to 300.65, 450.81 and 138.19

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Solution

The fourth proportional to 300.65, 450.81 and 138.19 is: 207.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    300.65 : 450.81 = 138.19 : x
  2. Step 2: Convert to fraction form
    300.65/450.81 = 138.19/x
  3. Step 3: Cross multiply
    300.65x = 450.81 × 138.19
  4. Step 4: Simplify right side
    300.65x = 62,296.83
  5. Step 5: Solve for x
    x = 62,296.83/300.65
  6. Step 6: Final answer
    x = 207.21

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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.