Home / 138,709.20-191,417.92-78,299.48

Finding the Fourth Proportional to 138,709.20, 191,417.92 and 78,299.48

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Solution

The fourth proportional to 138,709.20, 191,417.92 and 78,299.48 is: 108,052.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,709.20 : 191,417.92 = 78,299.48 : x
  2. Step 2: Convert to fraction form
    138,709.20/191,417.92 = 78,299.48/x
  3. Step 3: Cross multiply
    138,709.20x = 191,417.92 × 78,299.48
  4. Step 4: Simplify right side
    138,709.20x = 14,987,923,598.68
  5. Step 5: Solve for x
    x = 14,987,923,598.68/138,709.20
  6. Step 6: Final answer
    x = 108,052.84

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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.