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Finding the Fourth Proportional to 5,279.78, 7,285.94 and 2,921.88

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Solution

The fourth proportional to 5,279.78, 7,285.94 and 2,921.88 is: 4,032.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,279.78 : 7,285.94 = 2,921.88 : x
  2. Step 2: Convert to fraction form
    5,279.78/7,285.94 = 2,921.88/x
  3. Step 3: Cross multiply
    5,279.78x = 7,285.94 × 2,921.88
  4. Step 4: Simplify right side
    5,279.78x = 21,288,642.37
  5. Step 5: Solve for x
    x = 21,288,642.37/5,279.78
  6. Step 6: Final answer
    x = 4,032.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.