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Finding the Fourth Proportional to 28,196.56, 38,893.65 and 18,138.11

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Solution

The fourth proportional to 28,196.56, 38,893.65 and 18,138.11 is: 25,019.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,196.56 : 38,893.65 = 18,138.11 : x
  2. Step 2: Convert to fraction form
    28,196.56/38,893.65 = 18,138.11/x
  3. Step 3: Cross multiply
    28,196.56x = 38,893.65 × 18,138.11
  4. Step 4: Simplify right side
    28,196.56x = 705,457,302.00
  5. Step 5: Solve for x
    x = 705,457,302.00/28,196.56
  6. Step 6: Final answer
    x = 25,019.27

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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.