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Finding the Fourth Proportional to 13,720.62, 20,559.06 and 8,786.20

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Solution

The fourth proportional to 13,720.62, 20,559.06 and 8,786.20 is: 13,165.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,720.62 : 20,559.06 = 8,786.20 : x
  2. Step 2: Convert to fraction form
    13,720.62/20,559.06 = 8,786.20/x
  3. Step 3: Cross multiply
    13,720.62x = 20,559.06 × 8,786.20
  4. Step 4: Simplify right side
    13,720.62x = 180,636,012.97
  5. Step 5: Solve for x
    x = 180,636,012.97/13,720.62
  6. Step 6: Final answer
    x = 13,165.30

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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.