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Finding the Fourth Proportional to 128,400.89, 192,642.34 and 61,847.75

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Solution

The fourth proportional to 128,400.89, 192,642.34 and 61,847.75 is: 92,791.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,400.89 : 192,642.34 = 61,847.75 : x
  2. Step 2: Convert to fraction form
    128,400.89/192,642.34 = 61,847.75/x
  3. Step 3: Cross multiply
    128,400.89x = 192,642.34 × 61,847.75
  4. Step 4: Simplify right side
    128,400.89x = 11,914,494,165.90
  5. Step 5: Solve for x
    x = 11,914,494,165.90/128,400.89
  6. Step 6: Final answer
    x = 92,791.37

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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.