Home / 3,918.78-5,408.10-2,150.51

Finding the Fourth Proportional to 3,918.78, 5,408.10 and 2,150.51

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Solution

The fourth proportional to 3,918.78, 5,408.10 and 2,150.51 is: 2,967.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,918.78 : 5,408.10 = 2,150.51 : x
  2. Step 2: Convert to fraction form
    3,918.78/5,408.10 = 2,150.51/x
  3. Step 3: Cross multiply
    3,918.78x = 5,408.10 × 2,150.51
  4. Step 4: Simplify right side
    3,918.78x = 11,630,146.09
  5. Step 5: Solve for x
    x = 11,630,146.09/3,918.78
  6. Step 6: Final answer
    x = 2,967.80

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1.5x scale

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.