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Finding the Fourth Proportional to 5,120.40, 7,682.40 and 2,199.60

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Solution

The fourth proportional to 5,120.40, 7,682.40 and 2,199.60 is: 3,300.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,120.40 : 7,682.40 = 2,199.60 : x
  2. Step 2: Convert to fraction form
    5,120.40/7,682.40 = 2,199.60/x
  3. Step 3: Cross multiply
    5,120.40x = 7,682.40 × 2,199.60
  4. Step 4: Simplify right side
    5,120.40x = 16,898,207.04
  5. Step 5: Solve for x
    x = 16,898,207.04/5,120.40
  6. Step 6: Final answer
    x = 3,300.17

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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.