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Finding the Fourth Proportional to 13,622.40, 20,404.80 and 12,163.20

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Solution

The fourth proportional to 13,622.40, 20,404.80 and 12,163.20 is: 18,219.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,622.40 : 20,404.80 = 12,163.20 : x
  2. Step 2: Convert to fraction form
    13,622.40/20,404.80 = 12,163.20/x
  3. Step 3: Cross multiply
    13,622.40x = 20,404.80 × 12,163.20
  4. Step 4: Simplify right side
    13,622.40x = 248,187,663.36
  5. Step 5: Solve for x
    x = 248,187,663.36/13,622.40
  6. Step 6: Final answer
    x = 18,219.08

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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.