Home / 1,917.20-2,643-1,286.60

Finding the Fourth Proportional to 1,917.20, 2,643 and 1,286.60

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Solution

The fourth proportional to 1,917.20, 2,643 and 1,286.60 is: 1,773.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,917.20 : 2,643 = 1,286.60 : x
  2. Step 2: Convert to fraction form
    1,917.20/2,643 = 1,286.60/x
  3. Step 3: Cross multiply
    1,917.20x = 2,643 × 1,286.60
  4. Step 4: Simplify right side
    1,917.20x = 3,400,483.80
  5. Step 5: Solve for x
    x = 3,400,483.80/1,917.20
  6. Step 6: Final answer
    x = 1,773.67

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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.