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Finding the Fourth Proportional to 128,280.40, 192,517.80 and 83,892.40

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Solution

The fourth proportional to 128,280.40, 192,517.80 and 83,892.40 is: 125,902.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,280.40 : 192,517.80 = 83,892.40 : x
  2. Step 2: Convert to fraction form
    128,280.40/192,517.80 = 83,892.40/x
  3. Step 3: Cross multiply
    128,280.40x = 192,517.80 × 83,892.40
  4. Step 4: Simplify right side
    128,280.40x = 16,150,780,284.72
  5. Step 5: Solve for x
    x = 16,150,780,284.72/128,280.40
  6. Step 6: Final answer
    x = 125,902.17

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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.