Home / 138,930.74-191,755.87-78,536.43

Finding the Fourth Proportional to 138,930.74, 191,755.87 and 78,536.43

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Solution

The fourth proportional to 138,930.74, 191,755.87 and 78,536.43 is: 108,398.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,930.74 : 191,755.87 = 78,536.43 : x
  2. Step 2: Convert to fraction form
    138,930.74/191,755.87 = 78,536.43/x
  3. Step 3: Cross multiply
    138,930.74x = 191,755.87 × 78,536.43
  4. Step 4: Simplify right side
    138,930.74x = 15,059,821,984.09
  5. Step 5: Solve for x
    x = 15,059,821,984.09/138,930.74
  6. Step 6: Final answer
    x = 108,398.05

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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.