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Finding the Fourth Proportional to 13,919.40, 20,900.70 and 8,087.40

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Solution

The fourth proportional to 13,919.40, 20,900.70 and 8,087.40 is: 12,143.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,919.40 : 20,900.70 = 8,087.40 : x
  2. Step 2: Convert to fraction form
    13,919.40/20,900.70 = 8,087.40/x
  3. Step 3: Cross multiply
    13,919.40x = 20,900.70 × 8,087.40
  4. Step 4: Simplify right side
    13,919.40x = 169,032,321.18
  5. Step 5: Solve for x
    x = 169,032,321.18/13,919.40
  6. Step 6: Final answer
    x = 12,143.65

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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.