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Finding the Fourth Proportional to 769.76, 1,155.04 and 307.78

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Solution

The fourth proportional to 769.76, 1,155.04 and 307.78 is: 461.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.76 : 1,155.04 = 307.78 : x
  2. Step 2: Convert to fraction form
    769.76/1,155.04 = 307.78/x
  3. Step 3: Cross multiply
    769.76x = 1,155.04 × 307.78
  4. Step 4: Simplify right side
    769.76x = 355,498.21
  5. Step 5: Solve for x
    x = 355,498.21/769.76
  6. Step 6: Final answer
    x = 461.83

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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.