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Finding the Fourth Proportional to 128,321.90, 192,810.90 and 113,887.70

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Solution

The fourth proportional to 128,321.90, 192,810.90 and 113,887.70 is: 171,122.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,321.90 : 192,810.90 = 113,887.70 : x
  2. Step 2: Convert to fraction form
    128,321.90/192,810.90 = 113,887.70/x
  3. Step 3: Cross multiply
    128,321.90x = 192,810.90 × 113,887.70
  4. Step 4: Simplify right side
    128,321.90x = 21,958,789,935.93
  5. Step 5: Solve for x
    x = 21,958,789,935.93/128,321.90
  6. Step 6: Final answer
    x = 171,122.70

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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.