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Finding the Fourth Proportional to 66,078.21, 91,087.29 and 40,537.29

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Solution

The fourth proportional to 66,078.21, 91,087.29 and 40,537.29 is: 55,879.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,078.21 : 91,087.29 = 40,537.29 : x
  2. Step 2: Convert to fraction form
    66,078.21/91,087.29 = 40,537.29/x
  3. Step 3: Cross multiply
    66,078.21x = 91,087.29 × 40,537.29
  4. Step 4: Simplify right side
    66,078.21x = 3,692,431,890.04
  5. Step 5: Solve for x
    x = 3,692,431,890.04/66,078.21
  6. Step 6: Final answer
    x = 55,879.72

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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.