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Finding the Fourth Proportional to 2,611.65, 3,917.73 and 762.78

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Solution

The fourth proportional to 2,611.65, 3,917.73 and 762.78 is: 1,144.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,611.65 : 3,917.73 = 762.78 : x
  2. Step 2: Convert to fraction form
    2,611.65/3,917.73 = 762.78/x
  3. Step 3: Cross multiply
    2,611.65x = 3,917.73 × 762.78
  4. Step 4: Simplify right side
    2,611.65x = 2,988,362.28
  5. Step 5: Solve for x
    x = 2,988,362.28/2,611.65
  6. Step 6: Final answer
    x = 1,144.25

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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.