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Finding the Fourth Proportional to 1,949.34, 2,921.94 and 853.41

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Solution

The fourth proportional to 1,949.34, 2,921.94 and 853.41 is: 1,279.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,949.34 : 2,921.94 = 853.41 : x
  2. Step 2: Convert to fraction form
    1,949.34/2,921.94 = 853.41/x
  3. Step 3: Cross multiply
    1,949.34x = 2,921.94 × 853.41
  4. Step 4: Simplify right side
    1,949.34x = 2,493,612.82
  5. Step 5: Solve for x
    x = 2,493,612.82/1,949.34
  6. Step 6: Final answer
    x = 1,279.21

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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.