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Finding the Fourth Proportional to 1,928.88, 2,891.70 and 629.64

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Solution

The fourth proportional to 1,928.88, 2,891.70 and 629.64 is: 943.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,928.88 : 2,891.70 = 629.64 : x
  2. Step 2: Convert to fraction form
    1,928.88/2,891.70 = 629.64/x
  3. Step 3: Cross multiply
    1,928.88x = 2,891.70 × 629.64
  4. Step 4: Simplify right side
    1,928.88x = 1,820,729.99
  5. Step 5: Solve for x
    x = 1,820,729.99/1,928.88
  6. Step 6: Final answer
    x = 943.93

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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.