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Finding the Fourth Proportional to 920.09, 1,379.97 and 270.65

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Solution

The fourth proportional to 920.09, 1,379.97 and 270.65 is: 405.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.09 : 1,379.97 = 270.65 : x
  2. Step 2: Convert to fraction form
    920.09/1,379.97 = 270.65/x
  3. Step 3: Cross multiply
    920.09x = 1,379.97 × 270.65
  4. Step 4: Simplify right side
    920.09x = 373,481.98
  5. Step 5: Solve for x
    x = 373,481.98/920.09
  6. Step 6: Final answer
    x = 405.92

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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.