Home / 138,936.18-191,739.39-78,509.37

Finding the Fourth Proportional to 138,936.18, 191,739.39 and 78,509.37

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Solution

The fourth proportional to 138,936.18, 191,739.39 and 78,509.37 is: 108,347.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,936.18 : 191,739.39 = 78,509.37 : x
  2. Step 2: Convert to fraction form
    138,936.18/191,739.39 = 78,509.37/x
  3. Step 3: Cross multiply
    138,936.18x = 191,739.39 × 78,509.37
  4. Step 4: Simplify right side
    138,936.18x = 15,053,338,713.08
  5. Step 5: Solve for x
    x = 15,053,338,713.08/138,936.18
  6. Step 6: Final answer
    x = 108,347.15

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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.