Home / 138,539.69-191,180.94-78,109.80

Finding the Fourth Proportional to 138,539.69, 191,180.94 and 78,109.80

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Solution

The fourth proportional to 138,539.69, 191,180.94 and 78,109.80 is: 107,789.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,539.69 : 191,180.94 = 78,109.80 : x
  2. Step 2: Convert to fraction form
    138,539.69/191,180.94 = 78,109.80/x
  3. Step 3: Cross multiply
    138,539.69x = 191,180.94 × 78,109.80
  4. Step 4: Simplify right side
    138,539.69x = 14,933,104,987.21
  5. Step 5: Solve for x
    x = 14,933,104,987.21/138,539.69
  6. Step 6: Final answer
    x = 107,789.37

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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.