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Finding the Fourth Proportional to 2,800.85, 4,201.25 and 720.86

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Solution

The fourth proportional to 2,800.85, 4,201.25 and 720.86 is: 1,081.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,800.85 : 4,201.25 = 720.86 : x
  2. Step 2: Convert to fraction form
    2,800.85/4,201.25 = 720.86/x
  3. Step 3: Cross multiply
    2,800.85x = 4,201.25 × 720.86
  4. Step 4: Simplify right side
    2,800.85x = 3,028,488.46
  5. Step 5: Solve for x
    x = 3,028,488.46/2,800.85
  6. Step 6: Final answer
    x = 1,081.28

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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.