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Finding the Fourth Proportional to 139,287.84, 192,229.16 and 78,869.12

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Solution

The fourth proportional to 139,287.84, 192,229.16 and 78,869.12 is: 108,846.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,287.84 : 192,229.16 = 78,869.12 : x
  2. Step 2: Convert to fraction form
    139,287.84/192,229.16 = 78,869.12/x
  3. Step 3: Cross multiply
    139,287.84x = 192,229.16 × 78,869.12
  4. Step 4: Simplify right side
    139,287.84x = 15,160,944,687.54
  5. Step 5: Solve for x
    x = 15,160,944,687.54/139,287.84
  6. Step 6: Final answer
    x = 108,846.15

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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.