Home / 138,519.03-191,144.80-78,104.51

Finding the Fourth Proportional to 138,519.03, 191,144.80 and 78,104.51

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Solution

The fourth proportional to 138,519.03, 191,144.80 and 78,104.51 is: 107,777.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,519.03 : 191,144.80 = 78,104.51 : x
  2. Step 2: Convert to fraction form
    138,519.03/191,144.80 = 78,104.51/x
  3. Step 3: Cross multiply
    138,519.03x = 191,144.80 × 78,104.51
  4. Step 4: Simplify right side
    138,519.03x = 14,929,270,943.05
  5. Step 5: Solve for x
    x = 14,929,270,943.05/138,519.03
  6. Step 6: Final answer
    x = 107,777.76

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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.