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Finding the Fourth Proportional to 139,809.53, 192,945.93 and 79,357.16

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Solution

The fourth proportional to 139,809.53, 192,945.93 and 79,357.16 is: 109,517.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,809.53 : 192,945.93 = 79,357.16 : x
  2. Step 2: Convert to fraction form
    139,809.53/192,945.93 = 79,357.16/x
  3. Step 3: Cross multiply
    139,809.53x = 192,945.93 × 79,357.16
  4. Step 4: Simplify right side
    139,809.53x = 15,311,641,038.36
  5. Step 5: Solve for x
    x = 15,311,641,038.36/139,809.53
  6. Step 6: Final answer
    x = 109,517.86

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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.