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Finding the Fourth Proportional to 1,873.88, 2,811.12 and 641

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Solution

The fourth proportional to 1,873.88, 2,811.12 and 641 is: 961.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,873.88 : 2,811.12 = 641 : x
  2. Step 2: Convert to fraction form
    1,873.88/2,811.12 = 641/x
  3. Step 3: Cross multiply
    1,873.88x = 2,811.12 × 641
  4. Step 4: Simplify right side
    1,873.88x = 1,801,927.92
  5. Step 5: Solve for x
    x = 1,801,927.92/1,873.88
  6. Step 6: Final answer
    x = 961.60

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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.