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Finding the Fourth Proportional to 128,520.90, 192,810.15 and 49,628.10

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Solution

The fourth proportional to 128,520.90, 192,810.15 and 49,628.10 is: 74,453.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,520.90 : 192,810.15 = 49,628.10 : x
  2. Step 2: Convert to fraction form
    128,520.90/192,810.15 = 49,628.10/x
  3. Step 3: Cross multiply
    128,520.90x = 192,810.15 × 49,628.10
  4. Step 4: Simplify right side
    128,520.90x = 9,568,801,405.22
  5. Step 5: Solve for x
    x = 9,568,801,405.22/128,520.90
  6. Step 6: Final answer
    x = 74,453.27

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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.