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Finding the Fourth Proportional to 7,620.80, 11,425.80 and 3,462.80

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Solution

The fourth proportional to 7,620.80, 11,425.80 and 3,462.80 is: 5,191.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,620.80 : 11,425.80 = 3,462.80 : x
  2. Step 2: Convert to fraction form
    7,620.80/11,425.80 = 3,462.80/x
  3. Step 3: Cross multiply
    7,620.80x = 11,425.80 × 3,462.80
  4. Step 4: Simplify right side
    7,620.80x = 39,565,260.24
  5. Step 5: Solve for x
    x = 39,565,260.24/7,620.80
  6. Step 6: Final answer
    x = 5,191.75

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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.