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Finding the Fourth Proportional to 5,128.49, 7,076.49 and 2,889.86

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Solution

The fourth proportional to 5,128.49, 7,076.49 and 2,889.86 is: 3,987.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,128.49 : 7,076.49 = 2,889.86 : x
  2. Step 2: Convert to fraction form
    5,128.49/7,076.49 = 2,889.86/x
  3. Step 3: Cross multiply
    5,128.49x = 7,076.49 × 2,889.86
  4. Step 4: Simplify right side
    5,128.49x = 20,450,065.39
  5. Step 5: Solve for x
    x = 20,450,065.39/5,128.49
  6. Step 6: Final answer
    x = 3,987.54

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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.