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Finding the Fourth Proportional to 128,898.90, 193,357.56 and 53,943.57

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Solution

The fourth proportional to 128,898.90, 193,357.56 and 53,943.57 is: 80,919.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,898.90 : 193,357.56 = 53,943.57 : x
  2. Step 2: Convert to fraction form
    128,898.90/193,357.56 = 53,943.57/x
  3. Step 3: Cross multiply
    128,898.90x = 193,357.56 × 53,943.57
  4. Step 4: Simplify right side
    128,898.90x = 10,430,397,072.89
  5. Step 5: Solve for x
    x = 10,430,397,072.89/128,898.90
  6. Step 6: Final answer
    x = 80,919.21

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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.