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Finding the Fourth Proportional to 7,279.81, 10,919.68 and 2,085.69

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Solution

The fourth proportional to 7,279.81, 10,919.68 and 2,085.69 is: 3,128.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,279.81 : 10,919.68 = 2,085.69 : x
  2. Step 2: Convert to fraction form
    7,279.81/10,919.68 = 2,085.69/x
  3. Step 3: Cross multiply
    7,279.81x = 10,919.68 × 2,085.69
  4. Step 4: Simplify right side
    7,279.81x = 22,775,067.38
  5. Step 5: Solve for x
    x = 22,775,067.38/7,279.81
  6. Step 6: Final answer
    x = 3,128.52

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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.