Home / 2,120.67-3,178.53-1,145.07

Finding the Fourth Proportional to 2,120.67, 3,178.53 and 1,145.07

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Solution

The fourth proportional to 2,120.67, 3,178.53 and 1,145.07 is: 1,716.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,120.67 : 3,178.53 = 1,145.07 : x
  2. Step 2: Convert to fraction form
    2,120.67/3,178.53 = 1,145.07/x
  3. Step 3: Cross multiply
    2,120.67x = 3,178.53 × 1,145.07
  4. Step 4: Simplify right side
    2,120.67x = 3,639,639.35
  5. Step 5: Solve for x
    x = 3,639,639.35/2,120.67
  6. Step 6: Final answer
    x = 1,716.27

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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.