Home / 21,790.80-32,690.52-8,640.72

Finding the Fourth Proportional to 21,790.80, 32,690.52 and 8,640.72

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Solution

The fourth proportional to 21,790.80, 32,690.52 and 8,640.72 is: 12,962.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,790.80 : 32,690.52 = 8,640.72 : x
  2. Step 2: Convert to fraction form
    21,790.80/32,690.52 = 8,640.72/x
  3. Step 3: Cross multiply
    21,790.80x = 32,690.52 × 8,640.72
  4. Step 4: Simplify right side
    21,790.80x = 282,469,629.97
  5. Step 5: Solve for x
    x = 282,469,629.97/21,790.80
  6. Step 6: Final answer
    x = 12,962.79

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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.