Home / 138,914.21-191,709.87-78,494.24

Finding the Fourth Proportional to 138,914.21, 191,709.87 and 78,494.24

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Solution

The fourth proportional to 138,914.21, 191,709.87 and 78,494.24 is: 108,326.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,914.21 : 191,709.87 = 78,494.24 : x
  2. Step 2: Convert to fraction form
    138,914.21/191,709.87 = 78,494.24/x
  3. Step 3: Cross multiply
    138,914.21x = 191,709.87 × 78,494.24
  4. Step 4: Simplify right side
    138,914.21x = 15,048,120,546.15
  5. Step 5: Solve for x
    x = 15,048,120,546.15/138,914.21
  6. Step 6: Final answer
    x = 108,326.72

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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.