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Finding the Fourth Proportional to 6,620.78, 9,930.82 and 1,690.12

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Solution

The fourth proportional to 6,620.78, 9,930.82 and 1,690.12 is: 2,535.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,620.78 : 9,930.82 = 1,690.12 : x
  2. Step 2: Convert to fraction form
    6,620.78/9,930.82 = 1,690.12/x
  3. Step 3: Cross multiply
    6,620.78x = 9,930.82 × 1,690.12
  4. Step 4: Simplify right side
    6,620.78x = 16,784,277.50
  5. Step 5: Solve for x
    x = 16,784,277.50/6,620.78
  6. Step 6: Final answer
    x = 2,535.09

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1.5x scale

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.