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Finding the Fourth Proportional to 3,891.78, 5,370.64 and 2,123.37

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Solution

The fourth proportional to 3,891.78, 5,370.64 and 2,123.37 is: 2,930.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,891.78 : 5,370.64 = 2,123.37 : x
  2. Step 2: Convert to fraction form
    3,891.78/5,370.64 = 2,123.37/x
  3. Step 3: Cross multiply
    3,891.78x = 5,370.64 × 2,123.37
  4. Step 4: Simplify right side
    3,891.78x = 11,403,850.55
  5. Step 5: Solve for x
    x = 11,403,850.55/3,891.78
  6. Step 6: Final answer
    x = 2,930.24

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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.