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Finding the Fourth Proportional to 208,911.76, 313,367.64 and 75,761.80

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Solution

The fourth proportional to 208,911.76, 313,367.64 and 75,761.80 is: 113,642.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,911.76 : 313,367.64 = 75,761.80 : x
  2. Step 2: Convert to fraction form
    208,911.76/313,367.64 = 75,761.80/x
  3. Step 3: Cross multiply
    208,911.76x = 313,367.64 × 75,761.80
  4. Step 4: Simplify right side
    208,911.76x = 23,741,296,468.15
  5. Step 5: Solve for x
    x = 23,741,296,468.15/208,911.76
  6. Step 6: Final answer
    x = 113,642.70

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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.