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Finding the Fourth Proportional to 5,418.54, 8,128.08 and 1,721.06

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Solution

The fourth proportional to 5,418.54, 8,128.08 and 1,721.06 is: 2,581.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,418.54 : 8,128.08 = 1,721.06 : x
  2. Step 2: Convert to fraction form
    5,418.54/8,128.08 = 1,721.06/x
  3. Step 3: Cross multiply
    5,418.54x = 8,128.08 × 1,721.06
  4. Step 4: Simplify right side
    5,418.54x = 13,988,872.72
  5. Step 5: Solve for x
    x = 13,988,872.72/5,418.54
  6. Step 6: Final answer
    x = 2,581.67

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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.