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Finding the Fourth Proportional to 767.88, 1,151.78 and 280.88

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Solution

The fourth proportional to 767.88, 1,151.78 and 280.88 is: 421.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.88 : 1,151.78 = 280.88 : x
  2. Step 2: Convert to fraction form
    767.88/1,151.78 = 280.88/x
  3. Step 3: Cross multiply
    767.88x = 1,151.78 × 280.88
  4. Step 4: Simplify right side
    767.88x = 323,511.97
  5. Step 5: Solve for x
    x = 323,511.97/767.88
  6. Step 6: Final answer
    x = 421.31

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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.