Home / 138,816.86-191,556.37-78,393.47

Finding the Fourth Proportional to 138,816.86, 191,556.37 and 78,393.47

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Solution

The fourth proportional to 138,816.86, 191,556.37 and 78,393.47 is: 108,176.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,816.86 : 191,556.37 = 78,393.47 : x
  2. Step 2: Convert to fraction form
    138,816.86/191,556.37 = 78,393.47/x
  3. Step 3: Cross multiply
    138,816.86x = 191,556.37 × 78,393.47
  4. Step 4: Simplify right side
    138,816.86x = 15,016,768,542.14
  5. Step 5: Solve for x
    x = 15,016,768,542.14/138,816.86
  6. Step 6: Final answer
    x = 108,176.83

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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.