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Finding the Fourth Proportional to 1,918.75, 2,647.89 and 1,256.71

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Solution

The fourth proportional to 1,918.75, 2,647.89 and 1,256.71 is: 1,734.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,918.75 : 2,647.89 = 1,256.71 : x
  2. Step 2: Convert to fraction form
    1,918.75/2,647.89 = 1,256.71/x
  3. Step 3: Cross multiply
    1,918.75x = 2,647.89 × 1,256.71
  4. Step 4: Simplify right side
    1,918.75x = 3,327,629.84
  5. Step 5: Solve for x
    x = 3,327,629.84/1,918.75
  6. Step 6: Final answer
    x = 1,734.27

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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.