Home / 1,288.12-1,942.21-1,180.12

Finding the Fourth Proportional to 1,288.12, 1,942.21 and 1,180.12

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Solution

The fourth proportional to 1,288.12, 1,942.21 and 1,180.12 is: 1,779.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.12 : 1,942.21 = 1,180.12 : x
  2. Step 2: Convert to fraction form
    1,288.12/1,942.21 = 1,180.12/x
  3. Step 3: Cross multiply
    1,288.12x = 1,942.21 × 1,180.12
  4. Step 4: Simplify right side
    1,288.12x = 2,292,040.87
  5. Step 5: Solve for x
    x = 2,292,040.87/1,288.12
  6. Step 6: Final answer
    x = 1,779.37

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.