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Finding the Fourth Proportional to 139,302, 192,236.76 and 79,686

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Solution

The fourth proportional to 139,302, 192,236.76 and 79,686 is: 109,966.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,302 : 192,236.76 = 79,686 : x
  2. Step 2: Convert to fraction form
    139,302/192,236.76 = 79,686/x
  3. Step 3: Cross multiply
    139,302x = 192,236.76 × 79,686
  4. Step 4: Simplify right side
    139,302x = 15,318,578,457.36
  5. Step 5: Solve for x
    x = 15,318,578,457.36/139,302
  6. Step 6: Final answer
    x = 109,966.68

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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.