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Finding the Fourth Proportional to 66,642.36, 99,979.36 and 19,894.02

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Solution

The fourth proportional to 66,642.36, 99,979.36 and 19,894.02 is: 29,845.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,642.36 : 99,979.36 = 19,894.02 : x
  2. Step 2: Convert to fraction form
    66,642.36/99,979.36 = 19,894.02/x
  3. Step 3: Cross multiply
    66,642.36x = 99,979.36 × 19,894.02
  4. Step 4: Simplify right side
    66,642.36x = 1,988,991,387.43
  5. Step 5: Solve for x
    x = 1,988,991,387.43/66,642.36
  6. Step 6: Final answer
    x = 29,845.75

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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.