Home / 115,419.20-159,178.10-81,367.60

Finding the Fourth Proportional to 115,419.20, 159,178.10 and 81,367.60

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Solution

The fourth proportional to 115,419.20, 159,178.10 and 81,367.60 is: 112,216.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,419.20 : 159,178.10 = 81,367.60 : x
  2. Step 2: Convert to fraction form
    115,419.20/159,178.10 = 81,367.60/x
  3. Step 3: Cross multiply
    115,419.20x = 159,178.10 × 81,367.60
  4. Step 4: Simplify right side
    115,419.20x = 12,951,939,969.56
  5. Step 5: Solve for x
    x = 12,951,939,969.56/115,419.20
  6. Step 6: Final answer
    x = 112,216.51

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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.