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Finding the Fourth Proportional to 7,051.52, 10,578.80 and 2,120.80

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Solution

The fourth proportional to 7,051.52, 10,578.80 and 2,120.80 is: 3,181.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,051.52 : 10,578.80 = 2,120.80 : x
  2. Step 2: Convert to fraction form
    7,051.52/10,578.80 = 2,120.80/x
  3. Step 3: Cross multiply
    7,051.52x = 10,578.80 × 2,120.80
  4. Step 4: Simplify right side
    7,051.52x = 22,435,519.04
  5. Step 5: Solve for x
    x = 22,435,519.04/7,051.52
  6. Step 6: Final answer
    x = 3,181.66

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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.