Home / 3,891.80-5,370.65-2,123.39

Finding the Fourth Proportional to 3,891.80, 5,370.65 and 2,123.39

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Solution

The fourth proportional to 3,891.80, 5,370.65 and 2,123.39 is: 2,930.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,891.80 : 5,370.65 = 2,123.39 : x
  2. Step 2: Convert to fraction form
    3,891.80/5,370.65 = 2,123.39/x
  3. Step 3: Cross multiply
    3,891.80x = 5,370.65 × 2,123.39
  4. Step 4: Simplify right side
    3,891.80x = 11,403,984.50
  5. Step 5: Solve for x
    x = 11,403,984.50/3,891.80
  6. Step 6: Final answer
    x = 2,930.26

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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.