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Finding the Fourth Proportional to 18,838.80, 25,998.06 and 12,137.40

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Solution

The fourth proportional to 18,838.80, 25,998.06 and 12,137.40 is: 16,749.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,838.80 : 25,998.06 = 12,137.40 : x
  2. Step 2: Convert to fraction form
    18,838.80/25,998.06 = 12,137.40/x
  3. Step 3: Cross multiply
    18,838.80x = 25,998.06 × 12,137.40
  4. Step 4: Simplify right side
    18,838.80x = 315,548,853.44
  5. Step 5: Solve for x
    x = 315,548,853.44/18,838.80
  6. Step 6: Final answer
    x = 16,749.94

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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.