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Finding the Fourth Proportional to 1,965.11, 2,945.24 and 991.49

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Solution

The fourth proportional to 1,965.11, 2,945.24 and 991.49 is: 1,486.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,965.11 : 2,945.24 = 991.49 : x
  2. Step 2: Convert to fraction form
    1,965.11/2,945.24 = 991.49/x
  3. Step 3: Cross multiply
    1,965.11x = 2,945.24 × 991.49
  4. Step 4: Simplify right side
    1,965.11x = 2,920,171.05
  5. Step 5: Solve for x
    x = 2,920,171.05/1,965.11
  6. Step 6: Final answer
    x = 1,486.01

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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.