Home / 1,920.35-2,647.64-1,289.87

Finding the Fourth Proportional to 1,920.35, 2,647.64 and 1,289.87

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Solution

The fourth proportional to 1,920.35, 2,647.64 and 1,289.87 is: 1,778.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.35 : 2,647.64 = 1,289.87 : x
  2. Step 2: Convert to fraction form
    1,920.35/2,647.64 = 1,289.87/x
  3. Step 3: Cross multiply
    1,920.35x = 2,647.64 × 1,289.87
  4. Step 4: Simplify right side
    1,920.35x = 3,415,118.96
  5. Step 5: Solve for x
    x = 3,415,118.96/1,920.35
  6. Step 6: Final answer
    x = 1,778.39

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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.