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Finding the Fourth Proportional to 7,840.79, 11,761.22 and 2,650.31

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Solution

The fourth proportional to 7,840.79, 11,761.22 and 2,650.31 is: 3,975.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,840.79 : 11,761.22 = 2,650.31 : x
  2. Step 2: Convert to fraction form
    7,840.79/11,761.22 = 2,650.31/x
  3. Step 3: Cross multiply
    7,840.79x = 11,761.22 × 2,650.31
  4. Step 4: Simplify right side
    7,840.79x = 31,170,806.92
  5. Step 5: Solve for x
    x = 31,170,806.92/7,840.79
  6. Step 6: Final answer
    x = 3,975.47

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1.5x scale

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.