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Finding the Fourth Proportional to 1,191.76, 1,785.42 and 779.44

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Solution

The fourth proportional to 1,191.76, 1,785.42 and 779.44 is: 1,167.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.76 : 1,785.42 = 779.44 : x
  2. Step 2: Convert to fraction form
    1,191.76/1,785.42 = 779.44/x
  3. Step 3: Cross multiply
    1,191.76x = 1,785.42 × 779.44
  4. Step 4: Simplify right side
    1,191.76x = 1,391,627.76
  5. Step 5: Solve for x
    x = 1,391,627.76/1,191.76
  6. Step 6: Final answer
    x = 1,167.71

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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.