Home / 138,898.12-191,669.46-81,539.80

Finding the Fourth Proportional to 138,898.12, 191,669.46 and 81,539.80

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Solution

The fourth proportional to 138,898.12, 191,669.46 and 81,539.80 is: 112,519.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,898.12 : 191,669.46 = 81,539.80 : x
  2. Step 2: Convert to fraction form
    138,898.12/191,669.46 = 81,539.80/x
  3. Step 3: Cross multiply
    138,898.12x = 191,669.46 × 81,539.80
  4. Step 4: Simplify right side
    138,898.12x = 15,628,689,434.51
  5. Step 5: Solve for x
    x = 15,628,689,434.51/138,898.12
  6. Step 6: Final answer
    x = 112,519.09

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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.