Home / 1,291.12-1,782.92-1,151.24

Finding the Fourth Proportional to 1,291.12, 1,782.92 and 1,151.24

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Solution

The fourth proportional to 1,291.12, 1,782.92 and 1,151.24 is: 1,589.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.12 : 1,782.92 = 1,151.24 : x
  2. Step 2: Convert to fraction form
    1,291.12/1,782.92 = 1,151.24/x
  3. Step 3: Cross multiply
    1,291.12x = 1,782.92 × 1,151.24
  4. Step 4: Simplify right side
    1,291.12x = 2,052,568.82
  5. Step 5: Solve for x
    x = 2,052,568.82/1,291.12
  6. Step 6: Final answer
    x = 1,589.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.