Home / 138,789.64-191,529.12-78,359.59

Finding the Fourth Proportional to 138,789.64, 191,529.12 and 78,359.59

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Solution

The fourth proportional to 138,789.64, 191,529.12 and 78,359.59 is: 108,135.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,789.64 : 191,529.12 = 78,359.59 : x
  2. Step 2: Convert to fraction form
    138,789.64/191,529.12 = 78,359.59/x
  3. Step 3: Cross multiply
    138,789.64x = 191,529.12 × 78,359.59
  4. Step 4: Simplify right side
    138,789.64x = 15,008,143,316.26
  5. Step 5: Solve for x
    x = 15,008,143,316.26/138,789.64
  6. Step 6: Final answer
    x = 108,135.90

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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.