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Finding the Fourth Proportional to 1,940.80, 2,911.71 and 845.38

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Solution

The fourth proportional to 1,940.80, 2,911.71 and 845.38 is: 1,268.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,940.80 : 2,911.71 = 845.38 : x
  2. Step 2: Convert to fraction form
    1,940.80/2,911.71 = 845.38/x
  3. Step 3: Cross multiply
    1,940.80x = 2,911.71 × 845.38
  4. Step 4: Simplify right side
    1,940.80x = 2,461,501.40
  5. Step 5: Solve for x
    x = 2,461,501.40/1,940.80
  6. Step 6: Final answer
    x = 1,268.29

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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.