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Finding the Fourth Proportional to 13,690.57, 18,893.13 and 8,028.67

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Solution

The fourth proportional to 13,690.57, 18,893.13 and 8,028.67 is: 11,079.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,690.57 : 18,893.13 = 8,028.67 : x
  2. Step 2: Convert to fraction form
    13,690.57/18,893.13 = 8,028.67/x
  3. Step 3: Cross multiply
    13,690.57x = 18,893.13 × 8,028.67
  4. Step 4: Simplify right side
    13,690.57x = 151,686,709.28
  5. Step 5: Solve for x
    x = 151,686,709.28/13,690.57
  6. Step 6: Final answer
    x = 11,079.65

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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.