Home / 138,917.76-191,716.80-78,495.36

Finding the Fourth Proportional to 138,917.76, 191,716.80 and 78,495.36

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Solution

The fourth proportional to 138,917.76, 191,716.80 and 78,495.36 is: 108,329.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,917.76 : 191,716.80 = 78,495.36 : x
  2. Step 2: Convert to fraction form
    138,917.76/191,716.80 = 78,495.36/x
  3. Step 3: Cross multiply
    138,917.76x = 191,716.80 × 78,495.36
  4. Step 4: Simplify right side
    138,917.76x = 15,048,879,234.05
  5. Step 5: Solve for x
    x = 15,048,879,234.05/138,917.76
  6. Step 6: Final answer
    x = 108,329.41

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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.