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Finding the Fourth Proportional to 2,072.79, 3,107.97 and 611.55

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Solution

The fourth proportional to 2,072.79, 3,107.97 and 611.55 is: 916.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,072.79 : 3,107.97 = 611.55 : x
  2. Step 2: Convert to fraction form
    2,072.79/3,107.97 = 611.55/x
  3. Step 3: Cross multiply
    2,072.79x = 3,107.97 × 611.55
  4. Step 4: Simplify right side
    2,072.79x = 1,900,679.05
  5. Step 5: Solve for x
    x = 1,900,679.05/2,072.79
  6. Step 6: Final answer
    x = 916.97

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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.