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Finding the Fourth Proportional to 2,889.81, 3,986.89 and 1,693.78

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Solution

The fourth proportional to 2,889.81, 3,986.89 and 1,693.78 is: 2,336.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,889.81 : 3,986.89 = 1,693.78 : x
  2. Step 2: Convert to fraction form
    2,889.81/3,986.89 = 1,693.78/x
  3. Step 3: Cross multiply
    2,889.81x = 3,986.89 × 1,693.78
  4. Step 4: Simplify right side
    2,889.81x = 6,752,900.34
  5. Step 5: Solve for x
    x = 6,752,900.34/2,889.81
  6. Step 6: Final answer
    x = 2,336.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.