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Finding the Fourth Proportional to 13,919.20, 20,878.80 and 13,271.20

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Solution

The fourth proportional to 13,919.20, 20,878.80 and 13,271.20 is: 19,906.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,919.20 : 20,878.80 = 13,271.20 : x
  2. Step 2: Convert to fraction form
    13,919.20/20,878.80 = 13,271.20/x
  3. Step 3: Cross multiply
    13,919.20x = 20,878.80 × 13,271.20
  4. Step 4: Simplify right side
    13,919.20x = 277,086,730.56
  5. Step 5: Solve for x
    x = 277,086,730.56/13,919.20
  6. Step 6: Final answer
    x = 19,906.80

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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.