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Finding the Fourth Proportional to 128,143.80, 192,215.70 and 49,260.60

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Solution

The fourth proportional to 128,143.80, 192,215.70 and 49,260.60 is: 73,890.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,143.80 : 192,215.70 = 49,260.60 : x
  2. Step 2: Convert to fraction form
    128,143.80/192,215.70 = 49,260.60/x
  3. Step 3: Cross multiply
    128,143.80x = 192,215.70 × 49,260.60
  4. Step 4: Simplify right side
    128,143.80x = 9,468,660,711.42
  5. Step 5: Solve for x
    x = 9,468,660,711.42/128,143.80
  6. Step 6: Final answer
    x = 73,890.90

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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.