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Finding the Fourth Proportional to 2,800.10, 4,199.40 and 851.78

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Solution

The fourth proportional to 2,800.10, 4,199.40 and 851.78 is: 1,277.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,800.10 : 4,199.40 = 851.78 : x
  2. Step 2: Convert to fraction form
    2,800.10/4,199.40 = 851.78/x
  3. Step 3: Cross multiply
    2,800.10x = 4,199.40 × 851.78
  4. Step 4: Simplify right side
    2,800.10x = 3,576,964.93
  5. Step 5: Solve for x
    x = 3,576,964.93/2,800.10
  6. Step 6: Final answer
    x = 1,277.44

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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.