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Finding the Fourth Proportional to 300.93, 451.16 and 138.72

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Solution

The fourth proportional to 300.93, 451.16 and 138.72 is: 207.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    300.93 : 451.16 = 138.72 : x
  2. Step 2: Convert to fraction form
    300.93/451.16 = 138.72/x
  3. Step 3: Cross multiply
    300.93x = 451.16 × 138.72
  4. Step 4: Simplify right side
    300.93x = 62,584.22
  5. Step 5: Solve for x
    x = 62,584.22/300.93
  6. Step 6: Final answer
    x = 207.97

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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.