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Finding the Fourth Proportional to 779.23, 1,168.77 and 259.21

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Solution

The fourth proportional to 779.23, 1,168.77 and 259.21 is: 388.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.23 : 1,168.77 = 259.21 : x
  2. Step 2: Convert to fraction form
    779.23/1,168.77 = 259.21/x
  3. Step 3: Cross multiply
    779.23x = 1,168.77 × 259.21
  4. Step 4: Simplify right side
    779.23x = 302,956.87
  5. Step 5: Solve for x
    x = 302,956.87/779.23
  6. Step 6: Final answer
    x = 388.79

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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.