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Finding the Fourth Proportional to 66,640.80, 99,978.96 and 19,894.08

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Solution

The fourth proportional to 66,640.80, 99,978.96 and 19,894.08 is: 29,846.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,640.80 : 99,978.96 = 19,894.08 : x
  2. Step 2: Convert to fraction form
    66,640.80/99,978.96 = 19,894.08/x
  3. Step 3: Cross multiply
    66,640.80x = 99,978.96 × 19,894.08
  4. Step 4: Simplify right side
    66,640.80x = 1,988,989,428.56
  5. Step 5: Solve for x
    x = 1,988,989,428.56/66,640.80
  6. Step 6: Final answer
    x = 29,846.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.