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Finding the Fourth Proportional to 779.32, 1,169.20 and 231.48

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Solution

The fourth proportional to 779.32, 1,169.20 and 231.48 is: 347.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.32 : 1,169.20 = 231.48 : x
  2. Step 2: Convert to fraction form
    779.32/1,169.20 = 231.48/x
  3. Step 3: Cross multiply
    779.32x = 1,169.20 × 231.48
  4. Step 4: Simplify right side
    779.32x = 270,646.42
  5. Step 5: Solve for x
    x = 270,646.42/779.32
  6. Step 6: Final answer
    x = 347.29

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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.