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Finding the Fourth Proportional to 139,699.20, 192,811.48 and 79,275.46

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Solution

The fourth proportional to 139,699.20, 192,811.48 and 79,275.46 is: 109,415.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,699.20 : 192,811.48 = 79,275.46 : x
  2. Step 2: Convert to fraction form
    139,699.20/192,811.48 = 79,275.46/x
  3. Step 3: Cross multiply
    139,699.20x = 192,811.48 × 79,275.46
  4. Step 4: Simplify right side
    139,699.20x = 15,285,218,770.28
  5. Step 5: Solve for x
    x = 15,285,218,770.28/139,699.20
  6. Step 6: Final answer
    x = 109,415.22

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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.