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Finding the Fourth Proportional to 2,629.26, 3,945.93 and 987.30

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Solution

The fourth proportional to 2,629.26, 3,945.93 and 987.30 is: 1,481.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,629.26 : 3,945.93 = 987.30 : x
  2. Step 2: Convert to fraction form
    2,629.26/3,945.93 = 987.30/x
  3. Step 3: Cross multiply
    2,629.26x = 3,945.93 × 987.30
  4. Step 4: Simplify right side
    2,629.26x = 3,895,816.69
  5. Step 5: Solve for x
    x = 3,895,816.69/2,629.26
  6. Step 6: Final answer
    x = 1,481.72

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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.