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Finding the Fourth Proportional to 779.11, 1,169.28 and 389.09

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Solution

The fourth proportional to 779.11, 1,169.28 and 389.09 is: 583.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.11 : 1,169.28 = 389.09 : x
  2. Step 2: Convert to fraction form
    779.11/1,169.28 = 389.09/x
  3. Step 3: Cross multiply
    779.11x = 1,169.28 × 389.09
  4. Step 4: Simplify right side
    779.11x = 454,958.08
  5. Step 5: Solve for x
    x = 454,958.08/779.11
  6. Step 6: Final answer
    x = 583.95

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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.