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Finding the Fourth Proportional to 911.79, 1,367.69 and 500.85

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Solution

The fourth proportional to 911.79, 1,367.69 and 500.85 is: 751.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.79 : 1,367.69 = 500.85 : x
  2. Step 2: Convert to fraction form
    911.79/1,367.69 = 500.85/x
  3. Step 3: Cross multiply
    911.79x = 1,367.69 × 500.85
  4. Step 4: Simplify right side
    911.79x = 685,005.03
  5. Step 5: Solve for x
    x = 685,005.03/911.79
  6. Step 6: Final answer
    x = 751.28

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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.