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Finding the Fourth Proportional to 767.91, 1,151.69 and 219.94

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Solution

The fourth proportional to 767.91, 1,151.69 and 219.94 is: 329.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    767.91 : 1,151.69 = 219.94 : x
  2. Step 2: Convert to fraction form
    767.91/1,151.69 = 219.94/x
  3. Step 3: Cross multiply
    767.91x = 1,151.69 × 219.94
  4. Step 4: Simplify right side
    767.91x = 253,302.70
  5. Step 5: Solve for x
    x = 253,302.70/767.91
  6. Step 6: Final answer
    x = 329.86

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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.