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Finding the Fourth Proportional to 1,381.90, 1,906.85 and 934.75

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Solution

The fourth proportional to 1,381.90, 1,906.85 and 934.75 is: 1,289.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.90 : 1,906.85 = 934.75 : x
  2. Step 2: Convert to fraction form
    1,381.90/1,906.85 = 934.75/x
  3. Step 3: Cross multiply
    1,381.90x = 1,906.85 × 934.75
  4. Step 4: Simplify right side
    1,381.90x = 1,782,418.50
  5. Step 5: Solve for x
    x = 1,782,418.50/1,381.90
  6. Step 6: Final answer
    x = 1,289.83

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.