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Finding the Fourth Proportional to 2,078.66, 3,115.97 and 762.04

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Solution

The fourth proportional to 2,078.66, 3,115.97 and 762.04 is: 1,142.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,078.66 : 3,115.97 = 762.04 : x
  2. Step 2: Convert to fraction form
    2,078.66/3,115.97 = 762.04/x
  3. Step 3: Cross multiply
    2,078.66x = 3,115.97 × 762.04
  4. Step 4: Simplify right side
    2,078.66x = 2,374,496.72
  5. Step 5: Solve for x
    x = 2,374,496.72/2,078.66
  6. Step 6: Final answer
    x = 1,142.32

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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.