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Finding the Fourth Proportional to 779.24, 1,169.08 and 259.28

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Solution

The fourth proportional to 779.24, 1,169.08 and 259.28 is: 388.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.24 : 1,169.08 = 259.28 : x
  2. Step 2: Convert to fraction form
    779.24/1,169.08 = 259.28/x
  3. Step 3: Cross multiply
    779.24x = 1,169.08 × 259.28
  4. Step 4: Simplify right side
    779.24x = 303,119.06
  5. Step 5: Solve for x
    x = 303,119.06/779.24
  6. Step 6: Final answer
    x = 388.99

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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.