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Finding the Fourth Proportional to 3,391.15, 5,085.92 and 925.38

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Solution

The fourth proportional to 3,391.15, 5,085.92 and 925.38 is: 1,387.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,391.15 : 5,085.92 = 925.38 : x
  2. Step 2: Convert to fraction form
    3,391.15/5,085.92 = 925.38/x
  3. Step 3: Cross multiply
    3,391.15x = 5,085.92 × 925.38
  4. Step 4: Simplify right side
    3,391.15x = 4,706,415.52
  5. Step 5: Solve for x
    x = 4,706,415.52/3,391.15
  6. Step 6: Final answer
    x = 1,387.85

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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.