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Finding the Fourth Proportional to 21,900.61, 30,221.08 and 12,340.09

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Solution

The fourth proportional to 21,900.61, 30,221.08 and 12,340.09 is: 17,028.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,900.61 : 30,221.08 = 12,340.09 : x
  2. Step 2: Convert to fraction form
    21,900.61/30,221.08 = 12,340.09/x
  3. Step 3: Cross multiply
    21,900.61x = 30,221.08 × 12,340.09
  4. Step 4: Simplify right side
    21,900.61x = 372,930,847.10
  5. Step 5: Solve for x
    x = 372,930,847.10/21,900.61
  6. Step 6: Final answer
    x = 17,028.33

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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.