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Finding the Fourth Proportional to 1,940.90, 2,911.41 and 554.36

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Solution

The fourth proportional to 1,940.90, 2,911.41 and 554.36 is: 831.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,940.90 : 2,911.41 = 554.36 : x
  2. Step 2: Convert to fraction form
    1,940.90/2,911.41 = 554.36/x
  3. Step 3: Cross multiply
    1,940.90x = 2,911.41 × 554.36
  4. Step 4: Simplify right side
    1,940.90x = 1,613,954.69
  5. Step 5: Solve for x
    x = 1,613,954.69/1,940.90
  6. Step 6: Final answer
    x = 831.55

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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.