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Finding the Fourth Proportional to 1,945.97, 2,919.23 and 905.45

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Solution

The fourth proportional to 1,945.97, 2,919.23 and 905.45 is: 1,358.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,945.97 : 2,919.23 = 905.45 : x
  2. Step 2: Convert to fraction form
    1,945.97/2,919.23 = 905.45/x
  3. Step 3: Cross multiply
    1,945.97x = 2,919.23 × 905.45
  4. Step 4: Simplify right side
    1,945.97x = 2,643,201.08
  5. Step 5: Solve for x
    x = 2,643,201.08/1,945.97
  6. Step 6: Final answer
    x = 1,358.30

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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.