Home / 138,891.20-191,668.92-78,481.40

Finding the Fourth Proportional to 138,891.20, 191,668.92 and 78,481.40

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Solution

The fourth proportional to 138,891.20, 191,668.92 and 78,481.40 is: 108,303.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,891.20 : 191,668.92 = 78,481.40 : x
  2. Step 2: Convert to fraction form
    138,891.20/191,668.92 = 78,481.40/x
  3. Step 3: Cross multiply
    138,891.20x = 191,668.92 × 78,481.40
  4. Step 4: Simplify right side
    138,891.20x = 15,042,445,178.09
  5. Step 5: Solve for x
    x = 15,042,445,178.09/138,891.20
  6. Step 6: Final answer
    x = 108,303.80

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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.