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Finding the Fourth Proportional to 2,171.22, 3,255.51 and 853.39

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Solution

The fourth proportional to 2,171.22, 3,255.51 and 853.39 is: 1,279.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,171.22 : 3,255.51 = 853.39 : x
  2. Step 2: Convert to fraction form
    2,171.22/3,255.51 = 853.39/x
  3. Step 3: Cross multiply
    2,171.22x = 3,255.51 × 853.39
  4. Step 4: Simplify right side
    2,171.22x = 2,778,219.68
  5. Step 5: Solve for x
    x = 2,778,219.68/2,171.22
  6. Step 6: Final answer
    x = 1,279.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.