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Finding the Fourth Proportional to 3,508.90, 5,263.36 and 911.86

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Solution

The fourth proportional to 3,508.90, 5,263.36 and 911.86 is: 1,367.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,508.90 : 5,263.36 = 911.86 : x
  2. Step 2: Convert to fraction form
    3,508.90/5,263.36 = 911.86/x
  3. Step 3: Cross multiply
    3,508.90x = 5,263.36 × 911.86
  4. Step 4: Simplify right side
    3,508.90x = 4,799,447.45
  5. Step 5: Solve for x
    x = 4,799,447.45/3,508.90
  6. Step 6: Final answer
    x = 1,367.79

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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.