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Finding the Fourth Proportional to 13,990.96, 21,009.84 and 8,738.20

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Solution

The fourth proportional to 13,990.96, 21,009.84 and 8,738.20 is: 13,121.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,990.96 : 21,009.84 = 8,738.20 : x
  2. Step 2: Convert to fraction form
    13,990.96/21,009.84 = 8,738.20/x
  3. Step 3: Cross multiply
    13,990.96x = 21,009.84 × 8,738.20
  4. Step 4: Simplify right side
    13,990.96x = 183,588,183.89
  5. Step 5: Solve for x
    x = 183,588,183.89/13,990.96
  6. Step 6: Final answer
    x = 13,121.91

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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.