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Finding the Fourth Proportional to 28,361.70, 39,089.70 and 20,791.96

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Solution

The fourth proportional to 28,361.70, 39,089.70 and 20,791.96 is: 28,656.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,361.70 : 39,089.70 = 20,791.96 : x
  2. Step 2: Convert to fraction form
    28,361.70/39,089.70 = 20,791.96/x
  3. Step 3: Cross multiply
    28,361.70x = 39,089.70 × 20,791.96
  4. Step 4: Simplify right side
    28,361.70x = 812,751,478.81
  5. Step 5: Solve for x
    x = 812,751,478.81/28,361.70
  6. Step 6: Final answer
    x = 28,656.66

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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.