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Finding the Fourth Proportional to 3,805.72, 5,707.86 and 1,208.68

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Solution

The fourth proportional to 3,805.72, 5,707.86 and 1,208.68 is: 1,812.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,805.72 : 5,707.86 = 1,208.68 : x
  2. Step 2: Convert to fraction form
    3,805.72/5,707.86 = 1,208.68/x
  3. Step 3: Cross multiply
    3,805.72x = 5,707.86 × 1,208.68
  4. Step 4: Simplify right side
    3,805.72x = 6,898,976.22
  5. Step 5: Solve for x
    x = 6,898,976.22/3,805.72
  6. Step 6: Final answer
    x = 1,812.79

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1.5x scale

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.