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Finding the Fourth Proportional to 1,242.14, 1,863.63 and 779.38

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Solution

The fourth proportional to 1,242.14, 1,863.63 and 779.38 is: 1,169.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.14 : 1,863.63 = 779.38 : x
  2. Step 2: Convert to fraction form
    1,242.14/1,863.63 = 779.38/x
  3. Step 3: Cross multiply
    1,242.14x = 1,863.63 × 779.38
  4. Step 4: Simplify right side
    1,242.14x = 1,452,471.29
  5. Step 5: Solve for x
    x = 1,452,471.29/1,242.14
  6. Step 6: Final answer
    x = 1,169.33

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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.