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Finding the Fourth Proportional to 7,921.14, 11,879.28 and 2,988.24

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Solution

The fourth proportional to 7,921.14, 11,879.28 and 2,988.24 is: 4,481.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,921.14 : 11,879.28 = 2,988.24 : x
  2. Step 2: Convert to fraction form
    7,921.14/11,879.28 = 2,988.24/x
  3. Step 3: Cross multiply
    7,921.14x = 11,879.28 × 2,988.24
  4. Step 4: Simplify right side
    7,921.14x = 35,498,139.67
  5. Step 5: Solve for x
    x = 35,498,139.67/7,921.14
  6. Step 6: Final answer
    x = 4,481.44

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1.5x scale

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.