Home / 5,418.72-8,128.68-1,721.28

Finding the Fourth Proportional to 5,418.72, 8,128.68 and 1,721.28

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Solution

The fourth proportional to 5,418.72, 8,128.68 and 1,721.28 is: 2,582.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,418.72 : 8,128.68 = 1,721.28 : x
  2. Step 2: Convert to fraction form
    5,418.72/8,128.68 = 1,721.28/x
  3. Step 3: Cross multiply
    5,418.72x = 8,128.68 × 1,721.28
  4. Step 4: Simplify right side
    5,418.72x = 13,991,734.31
  5. Step 5: Solve for x
    x = 13,991,734.31/5,418.72
  6. Step 6: Final answer
    x = 2,582.11

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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.