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Finding the Fourth Proportional to 139,661.72, 192,718.51 and 79,213.04

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Solution

The fourth proportional to 139,661.72, 192,718.51 and 79,213.04 is: 109,305.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,661.72 : 192,718.51 = 79,213.04 : x
  2. Step 2: Convert to fraction form
    139,661.72/192,718.51 = 79,213.04/x
  3. Step 3: Cross multiply
    139,661.72x = 192,718.51 × 79,213.04
  4. Step 4: Simplify right side
    139,661.72x = 15,265,817,879.75
  5. Step 5: Solve for x
    x = 15,265,817,879.75/139,661.72
  6. Step 6: Final answer
    x = 109,305.67

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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.