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Finding the Fourth Proportional to 769.82, 1,155.15 and 336.96

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Solution

The fourth proportional to 769.82, 1,155.15 and 336.96 is: 505.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.82 : 1,155.15 = 336.96 : x
  2. Step 2: Convert to fraction form
    769.82/1,155.15 = 336.96/x
  3. Step 3: Cross multiply
    769.82x = 1,155.15 × 336.96
  4. Step 4: Simplify right side
    769.82x = 389,239.34
  5. Step 5: Solve for x
    x = 389,239.34/769.82
  6. Step 6: Final answer
    x = 505.63

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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.