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Finding the Fourth Proportional to 5,516.80, 8,272.80 and 1,620.40

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Solution

The fourth proportional to 5,516.80, 8,272.80 and 1,620.40 is: 2,429.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,516.80 : 8,272.80 = 1,620.40 : x
  2. Step 2: Convert to fraction form
    5,516.80/8,272.80 = 1,620.40/x
  3. Step 3: Cross multiply
    5,516.80x = 8,272.80 × 1,620.40
  4. Step 4: Simplify right side
    5,516.80x = 13,405,245.12
  5. Step 5: Solve for x
    x = 13,405,245.12/5,516.80
  6. Step 6: Final answer
    x = 2,429.90

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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.