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Finding the Fourth Proportional to 13,459.80, 20,189.70 and 8,551.20

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Solution

The fourth proportional to 13,459.80, 20,189.70 and 8,551.20 is: 12,826.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,459.80 : 20,189.70 = 8,551.20 : x
  2. Step 2: Convert to fraction form
    13,459.80/20,189.70 = 8,551.20/x
  3. Step 3: Cross multiply
    13,459.80x = 20,189.70 × 8,551.20
  4. Step 4: Simplify right side
    13,459.80x = 172,646,162.64
  5. Step 5: Solve for x
    x = 172,646,162.64/13,459.80
  6. Step 6: Final answer
    x = 12,826.80

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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.