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Finding the Fourth Proportional to 139,804.89, 192,932.95 and 76,142.64

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Solution

The fourth proportional to 139,804.89, 192,932.95 and 76,142.64 is: 105,078.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,804.89 : 192,932.95 = 76,142.64 : x
  2. Step 2: Convert to fraction form
    139,804.89/192,932.95 = 76,142.64/x
  3. Step 3: Cross multiply
    139,804.89x = 192,932.95 × 76,142.64
  4. Step 4: Simplify right side
    139,804.89x = 14,690,424,155.99
  5. Step 5: Solve for x
    x = 14,690,424,155.99/139,804.89
  6. Step 6: Final answer
    x = 105,078.04

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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.