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Finding the Fourth Proportional to 128,043.20, 192,007.20 and 49,131.20

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Solution

The fourth proportional to 128,043.20, 192,007.20 and 49,131.20 is: 73,674.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,043.20 : 192,007.20 = 49,131.20 : x
  2. Step 2: Convert to fraction form
    128,043.20/192,007.20 = 49,131.20/x
  3. Step 3: Cross multiply
    128,043.20x = 192,007.20 × 49,131.20
  4. Step 4: Simplify right side
    128,043.20x = 9,433,544,144.64
  5. Step 5: Solve for x
    x = 9,433,544,144.64/128,043.20
  6. Step 6: Final answer
    x = 73,674.70

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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.