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Finding the Fourth Proportional to 5,279.98, 7,921.78 and 1,994.02

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Solution

The fourth proportional to 5,279.98, 7,921.78 and 1,994.02 is: 2,991.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,279.98 : 7,921.78 = 1,994.02 : x
  2. Step 2: Convert to fraction form
    5,279.98/7,921.78 = 1,994.02/x
  3. Step 3: Cross multiply
    5,279.98x = 7,921.78 × 1,994.02
  4. Step 4: Simplify right side
    5,279.98x = 15,796,187.76
  5. Step 5: Solve for x
    x = 15,796,187.76/5,279.98
  6. Step 6: Final answer
    x = 2,991.71

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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.