Home / 138,679.91-191,367.38-78,265.25

Finding the Fourth Proportional to 138,679.91, 191,367.38 and 78,265.25

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Solution

The fourth proportional to 138,679.91, 191,367.38 and 78,265.25 is: 107,999.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,679.91 : 191,367.38 = 78,265.25 : x
  2. Step 2: Convert to fraction form
    138,679.91/191,367.38 = 78,265.25/x
  3. Step 3: Cross multiply
    138,679.91x = 191,367.38 × 78,265.25
  4. Step 4: Simplify right side
    138,679.91x = 14,977,415,076.37
  5. Step 5: Solve for x
    x = 14,977,415,076.37/138,679.91
  6. Step 6: Final answer
    x = 107,999.89

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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.