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Finding the Fourth Proportional to 779.05, 1,168.80 and 259.14

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Solution

The fourth proportional to 779.05, 1,168.80 and 259.14 is: 388.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.05 : 1,168.80 = 259.14 : x
  2. Step 2: Convert to fraction form
    779.05/1,168.80 = 259.14/x
  3. Step 3: Cross multiply
    779.05x = 1,168.80 × 259.14
  4. Step 4: Simplify right side
    779.05x = 302,882.83
  5. Step 5: Solve for x
    x = 302,882.83/779.05
  6. Step 6: Final answer
    x = 388.78

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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.