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Finding the Fourth Proportional to 128,512.80, 192,769.20 and 106,394.40

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Solution

The fourth proportional to 128,512.80, 192,769.20 and 106,394.40 is: 159,591.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,512.80 : 192,769.20 = 106,394.40 : x
  2. Step 2: Convert to fraction form
    128,512.80/192,769.20 = 106,394.40/x
  3. Step 3: Cross multiply
    128,512.80x = 192,769.20 × 106,394.40
  4. Step 4: Simplify right side
    128,512.80x = 20,509,563,372.48
  5. Step 5: Solve for x
    x = 20,509,563,372.48/128,512.80
  6. Step 6: Final answer
    x = 159,591.60

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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.