Home / 128,143.20-192,214.80-83,906.40

Finding the Fourth Proportional to 128,143.20, 192,214.80 and 83,906.40

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Solution

The fourth proportional to 128,143.20, 192,214.80 and 83,906.40 is: 125,859.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,143.20 : 192,214.80 = 83,906.40 : x
  2. Step 2: Convert to fraction form
    128,143.20/192,214.80 = 83,906.40/x
  3. Step 3: Cross multiply
    128,143.20x = 192,214.80 × 83,906.40
  4. Step 4: Simplify right side
    128,143.20x = 16,128,051,894.72
  5. Step 5: Solve for x
    x = 16,128,051,894.72/128,143.20
  6. Step 6: Final answer
    x = 125,859.60

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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.