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Finding the Fourth Proportional to 5,287.78, 7,932.90 and 2,821.30

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Solution

The fourth proportional to 5,287.78, 7,932.90 and 2,821.30 is: 4,232.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,287.78 : 7,932.90 = 2,821.30 : x
  2. Step 2: Convert to fraction form
    5,287.78/7,932.90 = 2,821.30/x
  3. Step 3: Cross multiply
    5,287.78x = 7,932.90 × 2,821.30
  4. Step 4: Simplify right side
    5,287.78x = 22,381,090.77
  5. Step 5: Solve for x
    x = 22,381,090.77/5,287.78
  6. Step 6: Final answer
    x = 4,232.61

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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.