Home / 138,736.17-191,456.55-78,309.36

Finding the Fourth Proportional to 138,736.17, 191,456.55 and 78,309.36

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Solution

The fourth proportional to 138,736.17, 191,456.55 and 78,309.36 is: 108,067.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,736.17 : 191,456.55 = 78,309.36 : x
  2. Step 2: Convert to fraction form
    138,736.17/191,456.55 = 78,309.36/x
  3. Step 3: Cross multiply
    138,736.17x = 191,456.55 × 78,309.36
  4. Step 4: Simplify right side
    138,736.17x = 14,992,839,898.31
  5. Step 5: Solve for x
    x = 14,992,839,898.31/138,736.17
  6. Step 6: Final answer
    x = 108,067.28

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1.5x scale

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.