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Finding the Fourth Proportional to 21,786.40, 30,064.40 and 11,850.40

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Solution

The fourth proportional to 21,786.40, 30,064.40 and 11,850.40 is: 16,353.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,786.40 : 30,064.40 = 11,850.40 : x
  2. Step 2: Convert to fraction form
    21,786.40/30,064.40 = 11,850.40/x
  3. Step 3: Cross multiply
    21,786.40x = 30,064.40 × 11,850.40
  4. Step 4: Simplify right side
    21,786.40x = 356,275,165.76
  5. Step 5: Solve for x
    x = 356,275,165.76/21,786.40
  6. Step 6: Final answer
    x = 16,353.10

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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.