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Finding the Fourth Proportional to 12,423.20, 18,634.80 and 11,040.80

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Solution

The fourth proportional to 12,423.20, 18,634.80 and 11,040.80 is: 16,561.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,423.20 : 18,634.80 = 11,040.80 : x
  2. Step 2: Convert to fraction form
    12,423.20/18,634.80 = 11,040.80/x
  3. Step 3: Cross multiply
    12,423.20x = 18,634.80 × 11,040.80
  4. Step 4: Simplify right side
    12,423.20x = 205,743,099.84
  5. Step 5: Solve for x
    x = 205,743,099.84/12,423.20
  6. Step 6: Final answer
    x = 16,561.20

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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.