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Finding the Fourth Proportional to 1,800.25, 2,698.25 and 811.91

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Solution

The fourth proportional to 1,800.25, 2,698.25 and 811.91 is: 1,216.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,800.25 : 2,698.25 = 811.91 : x
  2. Step 2: Convert to fraction form
    1,800.25/2,698.25 = 811.91/x
  3. Step 3: Cross multiply
    1,800.25x = 2,698.25 × 811.91
  4. Step 4: Simplify right side
    1,800.25x = 2,190,733.05
  5. Step 5: Solve for x
    x = 2,190,733.05/1,800.25
  6. Step 6: Final answer
    x = 1,216.90

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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.