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Finding the Fourth Proportional to 2,754.87, 4,128.79 and 1,290.80

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Solution

The fourth proportional to 2,754.87, 4,128.79 and 1,290.80 is: 1,934.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,754.87 : 4,128.79 = 1,290.80 : x
  2. Step 2: Convert to fraction form
    2,754.87/4,128.79 = 1,290.80/x
  3. Step 3: Cross multiply
    2,754.87x = 4,128.79 × 1,290.80
  4. Step 4: Simplify right side
    2,754.87x = 5,329,421.49
  5. Step 5: Solve for x
    x = 5,329,421.49/2,754.87
  6. Step 6: Final answer
    x = 1,934.55

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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.