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Finding the Fourth Proportional to 128,469.70, 192,704.55 and 81,756.10

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Solution

The fourth proportional to 128,469.70, 192,704.55 and 81,756.10 is: 122,634.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,469.70 : 192,704.55 = 81,756.10 : x
  2. Step 2: Convert to fraction form
    128,469.70/192,704.55 = 81,756.10/x
  3. Step 3: Cross multiply
    128,469.70x = 192,704.55 × 81,756.10
  4. Step 4: Simplify right side
    128,469.70x = 15,754,772,460.26
  5. Step 5: Solve for x
    x = 15,754,772,460.26/128,469.70
  6. Step 6: Final answer
    x = 122,634.15

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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.