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Finding the Fourth Proportional to 2,991.99, 4,128.74 and 1,872.88

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Solution

The fourth proportional to 2,991.99, 4,128.74 and 1,872.88 is: 2,584.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,991.99 : 4,128.74 = 1,872.88 : x
  2. Step 2: Convert to fraction form
    2,991.99/4,128.74 = 1,872.88/x
  3. Step 3: Cross multiply
    2,991.99x = 4,128.74 × 1,872.88
  4. Step 4: Simplify right side
    2,991.99x = 7,732,634.57
  5. Step 5: Solve for x
    x = 7,732,634.57/2,991.99
  6. Step 6: Final answer
    x = 2,584.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.