Home / 1,391.67-2,087.91-1,147.05

Finding the Fourth Proportional to 1,391.67, 2,087.91 and 1,147.05

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Solution

The fourth proportional to 1,391.67, 2,087.91 and 1,147.05 is: 1,720.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.67 : 2,087.91 = 1,147.05 : x
  2. Step 2: Convert to fraction form
    1,391.67/2,087.91 = 1,147.05/x
  3. Step 3: Cross multiply
    1,391.67x = 2,087.91 × 1,147.05
  4. Step 4: Simplify right side
    1,391.67x = 2,394,937.17
  5. Step 5: Solve for x
    x = 2,394,937.17/1,391.67
  6. Step 6: Final answer
    x = 1,720.91

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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.