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Finding the Fourth Proportional to 128,043.31, 192,048.09 and 39,289.38

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Solution

The fourth proportional to 128,043.31, 192,048.09 and 39,289.38 is: 58,928.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,043.31 : 192,048.09 = 39,289.38 : x
  2. Step 2: Convert to fraction form
    128,043.31/192,048.09 = 39,289.38/x
  3. Step 3: Cross multiply
    128,043.31x = 192,048.09 × 39,289.38
  4. Step 4: Simplify right side
    128,043.31x = 7,545,450,169.41
  5. Step 5: Solve for x
    x = 7,545,450,169.41/128,043.31
  6. Step 6: Final answer
    x = 58,928.89

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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.