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Finding the Fourth Proportional to 769.85, 1,154.78 and 307.75

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Solution

The fourth proportional to 769.85, 1,154.78 and 307.75 is: 461.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.85 : 1,154.78 = 307.75 : x
  2. Step 2: Convert to fraction form
    769.85/1,154.78 = 307.75/x
  3. Step 3: Cross multiply
    769.85x = 1,154.78 × 307.75
  4. Step 4: Simplify right side
    769.85x = 355,380.85
  5. Step 5: Solve for x
    x = 355,380.85/769.85
  6. Step 6: Final answer
    x = 461.62

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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.