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Finding the Fourth Proportional to 128,494.71, 192,631.21 and 61,843.14

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Solution

The fourth proportional to 128,494.71, 192,631.21 and 61,843.14 is: 92,711.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,494.71 : 192,631.21 = 61,843.14 : x
  2. Step 2: Convert to fraction form
    128,494.71/192,631.21 = 61,843.14/x
  3. Step 3: Cross multiply
    128,494.71x = 192,631.21 × 61,843.14
  4. Step 4: Simplify right side
    128,494.71x = 11,912,918,733.79
  5. Step 5: Solve for x
    x = 11,912,918,733.79/128,494.71
  6. Step 6: Final answer
    x = 92,711.36

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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.