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Finding the Fourth Proportional to 81,268.80, 121,665.60 and 57,940.80

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Solution

The fourth proportional to 81,268.80, 121,665.60 and 57,940.80 is: 86,741.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,268.80 : 121,665.60 = 57,940.80 : x
  2. Step 2: Convert to fraction form
    81,268.80/121,665.60 = 57,940.80/x
  3. Step 3: Cross multiply
    81,268.80x = 121,665.60 × 57,940.80
  4. Step 4: Simplify right side
    81,268.80x = 7,049,402,196.48
  5. Step 5: Solve for x
    x = 7,049,402,196.48/81,268.80
  6. Step 6: Final answer
    x = 86,741.80

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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.