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Finding the Fourth Proportional to 2,109, 2,910.60 and 1,177.68

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Solution

The fourth proportional to 2,109, 2,910.60 and 1,177.68 is: 1,625.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,109 : 2,910.60 = 1,177.68 : x
  2. Step 2: Convert to fraction form
    2,109/2,910.60 = 1,177.68/x
  3. Step 3: Cross multiply
    2,109x = 2,910.60 × 1,177.68
  4. Step 4: Simplify right side
    2,109x = 3,427,755.41
  5. Step 5: Solve for x
    x = 3,427,755.41/2,109
  6. Step 6: Final answer
    x = 1,625.30

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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.