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Finding the Fourth Proportional to 13,881.15, 20,823.78 and 4,019.20

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Solution

The fourth proportional to 13,881.15, 20,823.78 and 4,019.20 is: 6,029.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,881.15 : 20,823.78 = 4,019.20 : x
  2. Step 2: Convert to fraction form
    13,881.15/20,823.78 = 4,019.20/x
  3. Step 3: Cross multiply
    13,881.15x = 20,823.78 × 4,019.20
  4. Step 4: Simplify right side
    13,881.15x = 83,694,936.58
  5. Step 5: Solve for x
    x = 83,694,936.58/13,881.15
  6. Step 6: Final answer
    x = 6,029.40

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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.