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Finding the Fourth Proportional to 13,881.82, 19,153.92 and 7,911.88

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Solution

The fourth proportional to 13,881.82, 19,153.92 and 7,911.88 is: 10,916.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,881.82 : 19,153.92 = 7,911.88 : x
  2. Step 2: Convert to fraction form
    13,881.82/19,153.92 = 7,911.88/x
  3. Step 3: Cross multiply
    13,881.82x = 19,153.92 × 7,911.88
  4. Step 4: Simplify right side
    13,881.82x = 151,543,516.57
  5. Step 5: Solve for x
    x = 151,543,516.57/13,881.82
  6. Step 6: Final answer
    x = 10,916.69

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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.