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Finding the Fourth Proportional to 28,317, 39,019.83 and 21,904.64

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Solution

The fourth proportional to 28,317, 39,019.83 and 21,904.64 is: 30,183.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,317 : 39,019.83 = 21,904.64 : x
  2. Step 2: Convert to fraction form
    28,317/39,019.83 = 21,904.64/x
  3. Step 3: Cross multiply
    28,317x = 39,019.83 × 21,904.64
  4. Step 4: Simplify right side
    28,317x = 854,715,133.91
  5. Step 5: Solve for x
    x = 854,715,133.91/28,317
  6. Step 6: Final answer
    x = 30,183.82

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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.