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Finding the Fourth Proportional to 300.99, 451.35 and 138.81

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Solution

The fourth proportional to 300.99, 451.35 and 138.81 is: 208.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    300.99 : 451.35 = 138.81 : x
  2. Step 2: Convert to fraction form
    300.99/451.35 = 138.81/x
  3. Step 3: Cross multiply
    300.99x = 451.35 × 138.81
  4. Step 4: Simplify right side
    300.99x = 62,651.89
  5. Step 5: Solve for x
    x = 62,651.89/300.99
  6. Step 6: Final answer
    x = 208.15

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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.