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Finding the Fourth Proportional to 2,109.81, 3,164.36 and 723.09

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Solution

The fourth proportional to 2,109.81, 3,164.36 and 723.09 is: 1,084.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,109.81 : 3,164.36 = 723.09 : x
  2. Step 2: Convert to fraction form
    2,109.81/3,164.36 = 723.09/x
  3. Step 3: Cross multiply
    2,109.81x = 3,164.36 × 723.09
  4. Step 4: Simplify right side
    2,109.81x = 2,288,113.46
  5. Step 5: Solve for x
    x = 2,288,113.46/2,109.81
  6. Step 6: Final answer
    x = 1,084.51

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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.