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Finding the Fourth Proportional to 20,139.94, 27,786.85 and 11,638.94

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Solution

The fourth proportional to 20,139.94, 27,786.85 and 11,638.94 is: 16,058.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,139.94 : 27,786.85 = 11,638.94 : x
  2. Step 2: Convert to fraction form
    20,139.94/27,786.85 = 11,638.94/x
  3. Step 3: Cross multiply
    20,139.94x = 27,786.85 × 11,638.94
  4. Step 4: Simplify right side
    20,139.94x = 323,409,468.21
  5. Step 5: Solve for x
    x = 323,409,468.21/20,139.94
  6. Step 6: Final answer
    x = 16,058.11

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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.