Home / 149,120.12-205,786.65-81,137.57

Finding the Fourth Proportional to 149,120.12, 205,786.65 and 81,137.57

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Solution

The fourth proportional to 149,120.12, 205,786.65 and 81,137.57 is: 111,970.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    149,120.12 : 205,786.65 = 81,137.57 : x
  2. Step 2: Convert to fraction form
    149,120.12/205,786.65 = 81,137.57/x
  3. Step 3: Cross multiply
    149,120.12x = 205,786.65 × 81,137.57
  4. Step 4: Simplify right side
    149,120.12x = 16,697,028,719.44
  5. Step 5: Solve for x
    x = 16,697,028,719.44/149,120.12
  6. Step 6: Final answer
    x = 111,970.33

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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.