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Finding the Fourth Proportional to 139,853, 192,990.38 and 79,415.66

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Solution

The fourth proportional to 139,853, 192,990.38 and 79,415.66 is: 109,589.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,853 : 192,990.38 = 79,415.66 : x
  2. Step 2: Convert to fraction form
    139,853/192,990.38 = 79,415.66/x
  3. Step 3: Cross multiply
    139,853x = 192,990.38 × 79,415.66
  4. Step 4: Simplify right side
    139,853x = 15,326,458,401.35
  5. Step 5: Solve for x
    x = 15,326,458,401.35/139,853
  6. Step 6: Final answer
    x = 109,589.77

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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.