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Finding the Fourth Proportional to 7,821.87, 11,732.81 and 1,978.48

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Solution

The fourth proportional to 7,821.87, 11,732.81 and 1,978.48 is: 2,967.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,821.87 : 11,732.81 = 1,978.48 : x
  2. Step 2: Convert to fraction form
    7,821.87/11,732.81 = 1,978.48/x
  3. Step 3: Cross multiply
    7,821.87x = 11,732.81 × 1,978.48
  4. Step 4: Simplify right side
    7,821.87x = 23,213,101.83
  5. Step 5: Solve for x
    x = 23,213,101.83/7,821.87
  6. Step 6: Final answer
    x = 2,967.72

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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.