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Finding the Fourth Proportional to 2,419.71, 3,629.21 and 776.09

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Solution

The fourth proportional to 2,419.71, 3,629.21 and 776.09 is: 1,164.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,419.71 : 3,629.21 = 776.09 : x
  2. Step 2: Convert to fraction form
    2,419.71/3,629.21 = 776.09/x
  3. Step 3: Cross multiply
    2,419.71x = 3,629.21 × 776.09
  4. Step 4: Simplify right side
    2,419.71x = 2,816,571.56
  5. Step 5: Solve for x
    x = 2,816,571.56/2,419.71
  6. Step 6: Final answer
    x = 1,164.01

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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.