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Finding the Fourth Proportional to 911.69, 1,367.55 and 479.69

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Solution

The fourth proportional to 911.69, 1,367.55 and 479.69 is: 719.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.69 : 1,367.55 = 479.69 : x
  2. Step 2: Convert to fraction form
    911.69/1,367.55 = 479.69/x
  3. Step 3: Cross multiply
    911.69x = 1,367.55 × 479.69
  4. Step 4: Simplify right side
    911.69x = 656,000.06
  5. Step 5: Solve for x
    x = 656,000.06/911.69
  6. Step 6: Final answer
    x = 719.54

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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.