Home / 138,939.22-191,733.62-78,508.56

Finding the Fourth Proportional to 138,939.22, 191,733.62 and 78,508.56

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Solution

The fourth proportional to 138,939.22, 191,733.62 and 78,508.56 is: 108,340.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,939.22 : 191,733.62 = 78,508.56 : x
  2. Step 2: Convert to fraction form
    138,939.22/191,733.62 = 78,508.56/x
  3. Step 3: Cross multiply
    138,939.22x = 191,733.62 × 78,508.56
  4. Step 4: Simplify right side
    138,939.22x = 15,052,730,017.24
  5. Step 5: Solve for x
    x = 15,052,730,017.24/138,939.22
  6. Step 6: Final answer
    x = 108,340.40

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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.