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Finding the Fourth Proportional to 21,163.92, 29,204.79 and 12,211.80

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Solution

The fourth proportional to 21,163.92, 29,204.79 and 12,211.80 is: 16,851.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,163.92 : 29,204.79 = 12,211.80 : x
  2. Step 2: Convert to fraction form
    21,163.92/29,204.79 = 12,211.80/x
  3. Step 3: Cross multiply
    21,163.92x = 29,204.79 × 12,211.80
  4. Step 4: Simplify right side
    21,163.92x = 356,643,054.52
  5. Step 5: Solve for x
    x = 356,643,054.52/21,163.92
  6. Step 6: Final answer
    x = 16,851.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.