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Finding the Fourth Proportional to 139,644, 192,721.68 and 80,028

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Solution

The fourth proportional to 139,644, 192,721.68 and 80,028 is: 110,446.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,644 : 192,721.68 = 80,028 : x
  2. Step 2: Convert to fraction form
    139,644/192,721.68 = 80,028/x
  3. Step 3: Cross multiply
    139,644x = 192,721.68 × 80,028
  4. Step 4: Simplify right side
    139,644x = 15,423,130,607.04
  5. Step 5: Solve for x
    x = 15,423,130,607.04/139,644
  6. Step 6: Final answer
    x = 110,446.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.