Home / 1,911.60-2,638.44-1,247.30

Finding the Fourth Proportional to 1,911.60, 2,638.44 and 1,247.30

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Solution

The fourth proportional to 1,911.60, 2,638.44 and 1,247.30 is: 1,721.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.60 : 2,638.44 = 1,247.30 : x
  2. Step 2: Convert to fraction form
    1,911.60/2,638.44 = 1,247.30/x
  3. Step 3: Cross multiply
    1,911.60x = 2,638.44 × 1,247.30
  4. Step 4: Simplify right side
    1,911.60x = 3,290,926.21
  5. Step 5: Solve for x
    x = 3,290,926.21/1,911.60
  6. Step 6: Final answer
    x = 1,721.56

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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.