Home / 3,929.80-5,423.16-2,137.28

Finding the Fourth Proportional to 3,929.80, 5,423.16 and 2,137.28

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Solution

The fourth proportional to 3,929.80, 5,423.16 and 2,137.28 is: 2,949.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,929.80 : 5,423.16 = 2,137.28 : x
  2. Step 2: Convert to fraction form
    3,929.80/5,423.16 = 2,137.28/x
  3. Step 3: Cross multiply
    3,929.80x = 5,423.16 × 2,137.28
  4. Step 4: Simplify right side
    3,929.80x = 11,590,811.40
  5. Step 5: Solve for x
    x = 11,590,811.40/3,929.80
  6. Step 6: Final answer
    x = 2,949.47

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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.