Home / 139,233.26-192,139.80-78,815.36

Finding the Fourth Proportional to 139,233.26, 192,139.80 and 78,815.36

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Solution

The fourth proportional to 139,233.26, 192,139.80 and 78,815.36 is: 108,764.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,233.26 : 192,139.80 = 78,815.36 : x
  2. Step 2: Convert to fraction form
    139,233.26/192,139.80 = 78,815.36/x
  3. Step 3: Cross multiply
    139,233.26x = 192,139.80 × 78,815.36
  4. Step 4: Simplify right side
    139,233.26x = 15,143,567,507.33
  5. Step 5: Solve for x
    x = 15,143,567,507.33/139,233.26
  6. Step 6: Final answer
    x = 108,764.01

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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.