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Finding the Fourth Proportional to 128,611.40, 192,945.90 and 49,718.60

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Solution

The fourth proportional to 128,611.40, 192,945.90 and 49,718.60 is: 74,589.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,611.40 : 192,945.90 = 49,718.60 : x
  2. Step 2: Convert to fraction form
    128,611.40/192,945.90 = 49,718.60/x
  3. Step 3: Cross multiply
    128,611.40x = 192,945.90 × 49,718.60
  4. Step 4: Simplify right side
    128,611.40x = 9,593,000,023.74
  5. Step 5: Solve for x
    x = 9,593,000,023.74/128,611.40
  6. Step 6: Final answer
    x = 74,589.03

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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.