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Finding the Fourth Proportional to 300.39, 450.79 and 117.78

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Solution

The fourth proportional to 300.39, 450.79 and 117.78 is: 176.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    300.39 : 450.79 = 117.78 : x
  2. Step 2: Convert to fraction form
    300.39/450.79 = 117.78/x
  3. Step 3: Cross multiply
    300.39x = 450.79 × 117.78
  4. Step 4: Simplify right side
    300.39x = 53,093.46
  5. Step 5: Solve for x
    x = 53,093.46/300.39
  6. Step 6: Final answer
    x = 176.75

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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.