Home / 81,278.40-121,917.60-39,696.24

Finding the Fourth Proportional to 81,278.40, 121,917.60 and 39,696.24

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Solution

The fourth proportional to 81,278.40, 121,917.60 and 39,696.24 is: 59,544.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,278.40 : 121,917.60 = 39,696.24 : x
  2. Step 2: Convert to fraction form
    81,278.40/121,917.60 = 39,696.24/x
  3. Step 3: Cross multiply
    81,278.40x = 121,917.60 × 39,696.24
  4. Step 4: Simplify right side
    81,278.40x = 4,839,670,309.82
  5. Step 5: Solve for x
    x = 4,839,670,309.82/81,278.40
  6. Step 6: Final answer
    x = 59,544.36

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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.