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Finding the Fourth Proportional to 208,761.80, 312,912.30 and 115,334.60

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Solution

The fourth proportional to 208,761.80, 312,912.30 and 115,334.60 is: 172,874.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,761.80 : 312,912.30 = 115,334.60 : x
  2. Step 2: Convert to fraction form
    208,761.80/312,912.30 = 115,334.60/x
  3. Step 3: Cross multiply
    208,761.80x = 312,912.30 × 115,334.60
  4. Step 4: Simplify right side
    208,761.80x = 36,089,614,955.58
  5. Step 5: Solve for x
    x = 36,089,614,955.58/208,761.80
  6. Step 6: Final answer
    x = 172,874.61

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1.5x scale

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.