Home / 7,315.78-10,974.75-2,120.98

Finding the Fourth Proportional to 7,315.78, 10,974.75 and 2,120.98

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Solution

The fourth proportional to 7,315.78, 10,974.75 and 2,120.98 is: 3,181.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,315.78 : 10,974.75 = 2,120.98 : x
  2. Step 2: Convert to fraction form
    7,315.78/10,974.75 = 2,120.98/x
  3. Step 3: Cross multiply
    7,315.78x = 10,974.75 × 2,120.98
  4. Step 4: Simplify right side
    7,315.78x = 23,277,225.26
  5. Step 5: Solve for x
    x = 23,277,225.26/7,315.78
  6. Step 6: Final answer
    x = 3,181.78

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1.5x scale

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.