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Finding the Fourth Proportional to 81,736.70, 122,542.88 and 42,268.64

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Solution

The fourth proportional to 81,736.70, 122,542.88 and 42,268.64 is: 63,370.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,736.70 : 122,542.88 = 42,268.64 : x
  2. Step 2: Convert to fraction form
    81,736.70/122,542.88 = 42,268.64/x
  3. Step 3: Cross multiply
    81,736.70x = 122,542.88 × 42,268.64
  4. Step 4: Simplify right side
    81,736.70x = 5,179,720,055.23
  5. Step 5: Solve for x
    x = 5,179,720,055.23/81,736.70
  6. Step 6: Final answer
    x = 63,370.80

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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.