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Finding the Fourth Proportional to 1,945.13, 2,917.28 and 629

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Solution

The fourth proportional to 1,945.13, 2,917.28 and 629 is: 943.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,945.13 : 2,917.28 = 629 : x
  2. Step 2: Convert to fraction form
    1,945.13/2,917.28 = 629/x
  3. Step 3: Cross multiply
    1,945.13x = 2,917.28 × 629
  4. Step 4: Simplify right side
    1,945.13x = 1,834,969.12
  5. Step 5: Solve for x
    x = 1,834,969.12/1,945.13
  6. Step 6: Final answer
    x = 943.37

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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.