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Finding the Fourth Proportional to 28,039, 38,693.82 and 16,861

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Solution

The fourth proportional to 28,039, 38,693.82 and 16,861 is: 23,268.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,039 : 38,693.82 = 16,861 : x
  2. Step 2: Convert to fraction form
    28,039/38,693.82 = 16,861/x
  3. Step 3: Cross multiply
    28,039x = 38,693.82 × 16,861
  4. Step 4: Simplify right side
    28,039x = 652,416,499.02
  5. Step 5: Solve for x
    x = 652,416,499.02/28,039
  6. Step 6: Final answer
    x = 23,268.18

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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.