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Finding the Fourth Proportional to 19,990.80, 27,586.80 and 11,037.60

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Solution

The fourth proportional to 19,990.80, 27,586.80 and 11,037.60 is: 15,231.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,990.80 : 27,586.80 = 11,037.60 : x
  2. Step 2: Convert to fraction form
    19,990.80/27,586.80 = 11,037.60/x
  3. Step 3: Cross multiply
    19,990.80x = 27,586.80 × 11,037.60
  4. Step 4: Simplify right side
    19,990.80x = 304,492,063.68
  5. Step 5: Solve for x
    x = 304,492,063.68/19,990.80
  6. Step 6: Final answer
    x = 15,231.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.