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Finding the Fourth Proportional to 13,919.72, 20,881.89 and 6,900.03

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Solution

The fourth proportional to 13,919.72, 20,881.89 and 6,900.03 is: 10,351.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,919.72 : 20,881.89 = 6,900.03 : x
  2. Step 2: Convert to fraction form
    13,919.72/20,881.89 = 6,900.03/x
  3. Step 3: Cross multiply
    13,919.72x = 20,881.89 × 6,900.03
  4. Step 4: Simplify right side
    13,919.72x = 144,085,667.46
  5. Step 5: Solve for x
    x = 144,085,667.46/13,919.72
  6. Step 6: Final answer
    x = 10,351.19

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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.