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Finding the Fourth Proportional to 66,515, 99,788.94 and 19,767.68

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Solution

The fourth proportional to 66,515, 99,788.94 and 19,767.68 is: 29,656.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,515 : 99,788.94 = 19,767.68 : x
  2. Step 2: Convert to fraction form
    66,515/99,788.94 = 19,767.68/x
  3. Step 3: Cross multiply
    66,515x = 99,788.94 × 19,767.68
  4. Step 4: Simplify right side
    66,515x = 1,972,595,833.46
  5. Step 5: Solve for x
    x = 1,972,595,833.46/66,515
  6. Step 6: Final answer
    x = 29,656.41

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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.