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Finding the Fourth Proportional to 128,540, 192,889.80 and 61,986.92

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Solution

The fourth proportional to 128,540, 192,889.80 and 61,986.92 is: 93,018.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,540 : 192,889.80 = 61,986.92 : x
  2. Step 2: Convert to fraction form
    128,540/192,889.80 = 61,986.92/x
  3. Step 3: Cross multiply
    128,540x = 192,889.80 × 61,986.92
  4. Step 4: Simplify right side
    128,540x = 11,956,644,601.42
  5. Step 5: Solve for x
    x = 11,956,644,601.42/128,540
  6. Step 6: Final answer
    x = 93,018.86

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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.