Home / 1,643.70-2,265.78-1,311.60

Finding the Fourth Proportional to 1,643.70, 2,265.78 and 1,311.60

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Solution

The fourth proportional to 1,643.70, 2,265.78 and 1,311.60 is: 1,807.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,643.70 : 2,265.78 = 1,311.60 : x
  2. Step 2: Convert to fraction form
    1,643.70/2,265.78 = 1,311.60/x
  3. Step 3: Cross multiply
    1,643.70x = 2,265.78 × 1,311.60
  4. Step 4: Simplify right side
    1,643.70x = 2,971,797.05
  5. Step 5: Solve for x
    x = 2,971,797.05/1,643.70
  6. Step 6: Final answer
    x = 1,807.99

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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.