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Finding the Fourth Proportional to 66,198.72, 91,331.28 and 42,339.36

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Solution

The fourth proportional to 66,198.72, 91,331.28 and 42,339.36 is: 58,413.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,198.72 : 91,331.28 = 42,339.36 : x
  2. Step 2: Convert to fraction form
    66,198.72/91,331.28 = 42,339.36/x
  3. Step 3: Cross multiply
    66,198.72x = 91,331.28 × 42,339.36
  4. Step 4: Simplify right side
    66,198.72x = 3,866,907,943.18
  5. Step 5: Solve for x
    x = 3,866,907,943.18/66,198.72
  6. Step 6: Final answer
    x = 58,413.64

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.