Home / 2,105.45-2,905.70-1,161.39

Finding the Fourth Proportional to 2,105.45, 2,905.70 and 1,161.39

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Solution

The fourth proportional to 2,105.45, 2,905.70 and 1,161.39 is: 1,602.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,105.45 : 2,905.70 = 1,161.39 : x
  2. Step 2: Convert to fraction form
    2,105.45/2,905.70 = 1,161.39/x
  3. Step 3: Cross multiply
    2,105.45x = 2,905.70 × 1,161.39
  4. Step 4: Simplify right side
    2,105.45x = 3,374,645.12
  5. Step 5: Solve for x
    x = 3,374,645.12/2,105.45
  6. Step 6: Final answer
    x = 1,602.82

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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.