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Finding the Fourth Proportional to 13,889.21, 20,836.77 and 7,968.81

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Solution

The fourth proportional to 13,889.21, 20,836.77 and 7,968.81 is: 11,954.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,889.21 : 20,836.77 = 7,968.81 : x
  2. Step 2: Convert to fraction form
    13,889.21/20,836.77 = 7,968.81/x
  3. Step 3: Cross multiply
    13,889.21x = 20,836.77 × 7,968.81
  4. Step 4: Simplify right side
    13,889.21x = 166,044,261.14
  5. Step 5: Solve for x
    x = 166,044,261.14/13,889.21
  6. Step 6: Final answer
    x = 11,954.91

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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.