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Finding the Fourth Proportional to 6,690.80, 10,032.60 and 2,790.80

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Solution

The fourth proportional to 6,690.80, 10,032.60 and 2,790.80 is: 4,184.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,690.80 : 10,032.60 = 2,790.80 : x
  2. Step 2: Convert to fraction form
    6,690.80/10,032.60 = 2,790.80/x
  3. Step 3: Cross multiply
    6,690.80x = 10,032.60 × 2,790.80
  4. Step 4: Simplify right side
    6,690.80x = 27,998,980.08
  5. Step 5: Solve for x
    x = 27,998,980.08/6,690.80
  6. Step 6: Final answer
    x = 4,184.70

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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.