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Finding the Fourth Proportional to 139,351.34, 192,305.40 and 75,690.20

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Solution

The fourth proportional to 139,351.34, 192,305.40 and 75,690.20 is: 104,452.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,351.34 : 192,305.40 = 75,690.20 : x
  2. Step 2: Convert to fraction form
    139,351.34/192,305.40 = 75,690.20/x
  3. Step 3: Cross multiply
    139,351.34x = 192,305.40 × 75,690.20
  4. Step 4: Simplify right side
    139,351.34x = 14,555,634,187.08
  5. Step 5: Solve for x
    x = 14,555,634,187.08/139,351.34
  6. Step 6: Final answer
    x = 104,452.78

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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.