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Finding the Fourth Proportional to 128,688.80, 192,819.80 and 91,062.36

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Solution

The fourth proportional to 128,688.80, 192,819.80 and 91,062.36 is: 136,442.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,688.80 : 192,819.80 = 91,062.36 : x
  2. Step 2: Convert to fraction form
    128,688.80/192,819.80 = 91,062.36/x
  3. Step 3: Cross multiply
    128,688.80x = 192,819.80 × 91,062.36
  4. Step 4: Simplify right side
    128,688.80x = 17,558,626,270.38
  5. Step 5: Solve for x
    x = 17,558,626,270.38/128,688.80
  6. Step 6: Final answer
    x = 136,442.54

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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.