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Finding the Fourth Proportional to 133,128.87, 199,824.53 and 80,640.87

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Solution

The fourth proportional to 133,128.87, 199,824.53 and 80,640.87 is: 121,040.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    133,128.87 : 199,824.53 = 80,640.87 : x
  2. Step 2: Convert to fraction form
    133,128.87/199,824.53 = 80,640.87/x
  3. Step 3: Cross multiply
    133,128.87x = 199,824.53 × 80,640.87
  4. Step 4: Simplify right side
    133,128.87x = 16,114,023,543.34
  5. Step 5: Solve for x
    x = 16,114,023,543.34/133,128.87
  6. Step 6: Final answer
    x = 121,040.79

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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.