Home / 135,357.12-186,811.92-78,786.72

Finding the Fourth Proportional to 135,357.12, 186,811.92 and 78,786.72

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Solution

The fourth proportional to 135,357.12, 186,811.92 and 78,786.72 is: 108,736.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,357.12 : 186,811.92 = 78,786.72 : x
  2. Step 2: Convert to fraction form
    135,357.12/186,811.92 = 78,786.72/x
  3. Step 3: Cross multiply
    135,357.12x = 186,811.92 × 78,786.72
  4. Step 4: Simplify right side
    135,357.12x = 14,718,298,433.70
  5. Step 5: Solve for x
    x = 14,718,298,433.70/135,357.12
  6. Step 6: Final answer
    x = 108,736.79

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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.