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Finding the Fourth Proportional to 7,843.32, 11,722.56 and 7,220.64

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Solution

The fourth proportional to 7,843.32, 11,722.56 and 7,220.64 is: 10,791.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,843.32 : 11,722.56 = 7,220.64 : x
  2. Step 2: Convert to fraction form
    7,843.32/11,722.56 = 7,220.64/x
  3. Step 3: Cross multiply
    7,843.32x = 11,722.56 × 7,220.64
  4. Step 4: Simplify right side
    7,843.32x = 84,644,385.64
  5. Step 5: Solve for x
    x = 84,644,385.64/7,843.32
  6. Step 6: Final answer
    x = 10,791.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.