Home / 5,420.43-8,128.35-1,721.67

Finding the Fourth Proportional to 5,420.43, 8,128.35 and 1,721.67

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Solution

The fourth proportional to 5,420.43, 8,128.35 and 1,721.67 is: 2,581.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,420.43 : 8,128.35 = 1,721.67 : x
  2. Step 2: Convert to fraction form
    5,420.43/8,128.35 = 1,721.67/x
  3. Step 3: Cross multiply
    5,420.43x = 8,128.35 × 1,721.67
  4. Step 4: Simplify right side
    5,420.43x = 13,994,336.34
  5. Step 5: Solve for x
    x = 13,994,336.34/5,420.43
  6. Step 6: Final answer
    x = 2,581.78

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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.