Home / 128,629.91-192,963.55-39,890.56

Finding the Fourth Proportional to 128,629.91, 192,963.55 and 39,890.56

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Solution

The fourth proportional to 128,629.91, 192,963.55 and 39,890.56 is: 59,841.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,629.91 : 192,963.55 = 39,890.56 : x
  2. Step 2: Convert to fraction form
    128,629.91/192,963.55 = 39,890.56/x
  3. Step 3: Cross multiply
    128,629.91x = 192,963.55 × 39,890.56
  4. Step 4: Simplify right side
    128,629.91x = 7,697,424,069.09
  5. Step 5: Solve for x
    x = 7,697,424,069.09/128,629.91
  6. Step 6: Final answer
    x = 59,841.63

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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.