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Finding the Fourth Proportional to 13,200.90, 19,812.15 and 12,768.90

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Solution

The fourth proportional to 13,200.90, 19,812.15 and 12,768.90 is: 19,163.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,200.90 : 19,812.15 = 12,768.90 : x
  2. Step 2: Convert to fraction form
    13,200.90/19,812.15 = 12,768.90/x
  3. Step 3: Cross multiply
    13,200.90x = 19,812.15 × 12,768.90
  4. Step 4: Simplify right side
    13,200.90x = 252,979,362.14
  5. Step 5: Solve for x
    x = 252,979,362.14/13,200.90
  6. Step 6: Final answer
    x = 19,163.80

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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.