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Finding the Fourth Proportional to 139,378.73, 192,341.58 and 75,716.98

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Solution

The fourth proportional to 139,378.73, 192,341.58 and 75,716.98 is: 104,488.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,378.73 : 192,341.58 = 75,716.98 : x
  2. Step 2: Convert to fraction form
    139,378.73/192,341.58 = 75,716.98/x
  3. Step 3: Cross multiply
    139,378.73x = 192,341.58 × 75,716.98
  4. Step 4: Simplify right side
    139,378.73x = 14,563,523,566.03
  5. Step 5: Solve for x
    x = 14,563,523,566.03/139,378.73
  6. Step 6: Final answer
    x = 104,488.85

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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.