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Finding the Fourth Proportional to 1,189.36, 1,782.84 and 779.32

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Solution

The fourth proportional to 1,189.36, 1,782.84 and 779.32 is: 1,168.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.36 : 1,782.84 = 779.32 : x
  2. Step 2: Convert to fraction form
    1,189.36/1,782.84 = 779.32/x
  3. Step 3: Cross multiply
    1,189.36x = 1,782.84 × 779.32
  4. Step 4: Simplify right side
    1,189.36x = 1,389,402.87
  5. Step 5: Solve for x
    x = 1,389,402.87/1,189.36
  6. Step 6: Final answer
    x = 1,168.19

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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.