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Finding the Fourth Proportional to 779.15, 1,168.91 and 231.32

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Solution

The fourth proportional to 779.15, 1,168.91 and 231.32 is: 347.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.15 : 1,168.91 = 231.32 : x
  2. Step 2: Convert to fraction form
    779.15/1,168.91 = 231.32/x
  3. Step 3: Cross multiply
    779.15x = 1,168.91 × 231.32
  4. Step 4: Simplify right side
    779.15x = 270,392.26
  5. Step 5: Solve for x
    x = 270,392.26/779.15
  6. Step 6: Final answer
    x = 347.03

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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.