Home / 1,920.21-2,649.52-1,389.92

Finding the Fourth Proportional to 1,920.21, 2,649.52 and 1,389.92

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Solution

The fourth proportional to 1,920.21, 2,649.52 and 1,389.92 is: 1,917.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.21 : 2,649.52 = 1,389.92 : x
  2. Step 2: Convert to fraction form
    1,920.21/2,649.52 = 1,389.92/x
  3. Step 3: Cross multiply
    1,920.21x = 2,649.52 × 1,389.92
  4. Step 4: Simplify right side
    1,920.21x = 3,682,620.84
  5. Step 5: Solve for x
    x = 3,682,620.84/1,920.21
  6. Step 6: Final answer
    x = 1,917.82

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1.5x scale

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.