Home / 81,236.25-121,771.29-31,296.78

Finding the Fourth Proportional to 81,236.25, 121,771.29 and 31,296.78

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Solution

The fourth proportional to 81,236.25, 121,771.29 and 31,296.78 is: 46,913.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,236.25 : 121,771.29 = 31,296.78 : x
  2. Step 2: Convert to fraction form
    81,236.25/121,771.29 = 31,296.78/x
  3. Step 3: Cross multiply
    81,236.25x = 121,771.29 × 31,296.78
  4. Step 4: Simplify right side
    81,236.25x = 3,811,048,664.59
  5. Step 5: Solve for x
    x = 3,811,048,664.59/81,236.25
  6. Step 6: Final answer
    x = 46,913.16

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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.