Home / 81,106.97-111,114.69-78,074.64

Finding the Fourth Proportional to 81,106.97, 111,114.69 and 78,074.64

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Solution

The fourth proportional to 81,106.97, 111,114.69 and 78,074.64 is: 106,960.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,106.97 : 111,114.69 = 78,074.64 : x
  2. Step 2: Convert to fraction form
    81,106.97/111,114.69 = 78,074.64/x
  3. Step 3: Cross multiply
    81,106.97x = 111,114.69 × 78,074.64
  4. Step 4: Simplify right side
    81,106.97x = 8,675,239,127.68
  5. Step 5: Solve for x
    x = 8,675,239,127.68/81,106.97
  6. Step 6: Final answer
    x = 106,960.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.