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Finding the Fourth Proportional to 2,679.90, 4,019.88 and 1,292.94

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Solution

The fourth proportional to 2,679.90, 4,019.88 and 1,292.94 is: 1,939.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,679.90 : 4,019.88 = 1,292.94 : x
  2. Step 2: Convert to fraction form
    2,679.90/4,019.88 = 1,292.94/x
  3. Step 3: Cross multiply
    2,679.90x = 4,019.88 × 1,292.94
  4. Step 4: Simplify right side
    2,679.90x = 5,197,463.65
  5. Step 5: Solve for x
    x = 5,197,463.65/2,679.90
  6. Step 6: Final answer
    x = 1,939.42

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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.