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Finding the Fourth Proportional to 19,171, 28,638.56 and 13,860.64

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Solution

The fourth proportional to 19,171, 28,638.56 and 13,860.64 is: 20,705.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,171 : 28,638.56 = 13,860.64 : x
  2. Step 2: Convert to fraction form
    19,171/28,638.56 = 13,860.64/x
  3. Step 3: Cross multiply
    19,171x = 28,638.56 × 13,860.64
  4. Step 4: Simplify right side
    19,171x = 396,948,770.28
  5. Step 5: Solve for x
    x = 396,948,770.28/19,171
  6. Step 6: Final answer
    x = 20,705.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.