Home / 1,391.03-2,087.57-1,120.39

Finding the Fourth Proportional to 1,391.03, 2,087.57 and 1,120.39

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Solution

The fourth proportional to 1,391.03, 2,087.57 and 1,120.39 is: 1,681.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.03 : 2,087.57 = 1,120.39 : x
  2. Step 2: Convert to fraction form
    1,391.03/2,087.57 = 1,120.39/x
  3. Step 3: Cross multiply
    1,391.03x = 2,087.57 × 1,120.39
  4. Step 4: Simplify right side
    1,391.03x = 2,338,890.13
  5. Step 5: Solve for x
    x = 2,338,890.13/1,391.03
  6. Step 6: Final answer
    x = 1,681.41

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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.