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Finding the Fourth Proportional to 66,268.58, 91,415.79 and 39,391.97

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Solution

The fourth proportional to 66,268.58, 91,415.79 and 39,391.97 is: 54,340.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,268.58 : 91,415.79 = 39,391.97 : x
  2. Step 2: Convert to fraction form
    66,268.58/91,415.79 = 39,391.97/x
  3. Step 3: Cross multiply
    66,268.58x = 91,415.79 × 39,391.97
  4. Step 4: Simplify right side
    66,268.58x = 3,601,047,600.13
  5. Step 5: Solve for x
    x = 3,601,047,600.13/66,268.58
  6. Step 6: Final answer
    x = 54,340.20

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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.