Home / 5,179.78-7,148.10-2,821.90

Finding the Fourth Proportional to 5,179.78, 7,148.10 and 2,821.90

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Solution

The fourth proportional to 5,179.78, 7,148.10 and 2,821.90 is: 3,894.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,179.78 : 7,148.10 = 2,821.90 : x
  2. Step 2: Convert to fraction form
    5,179.78/7,148.10 = 2,821.90/x
  3. Step 3: Cross multiply
    5,179.78x = 7,148.10 × 2,821.90
  4. Step 4: Simplify right side
    5,179.78x = 20,171,223.39
  5. Step 5: Solve for x
    x = 20,171,223.39/5,179.78
  6. Step 6: Final answer
    x = 3,894.22

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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.