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Finding the Fourth Proportional to 139,670.28, 192,764.82 and 79,255.80

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Solution

The fourth proportional to 139,670.28, 192,764.82 and 79,255.80 is: 109,384.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,670.28 : 192,764.82 = 79,255.80 : x
  2. Step 2: Convert to fraction form
    139,670.28/192,764.82 = 79,255.80/x
  3. Step 3: Cross multiply
    139,670.28x = 192,764.82 × 79,255.80
  4. Step 4: Simplify right side
    139,670.28x = 15,277,730,020.96
  5. Step 5: Solve for x
    x = 15,277,730,020.96/139,670.28
  6. Step 6: Final answer
    x = 109,384.26

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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.