Home / 138,720.06-191,432.90-78,310.33

Finding the Fourth Proportional to 138,720.06, 191,432.90 and 78,310.33

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Solution

The fourth proportional to 138,720.06, 191,432.90 and 78,310.33 is: 108,067.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,720.06 : 191,432.90 = 78,310.33 : x
  2. Step 2: Convert to fraction form
    138,720.06/191,432.90 = 78,310.33/x
  3. Step 3: Cross multiply
    138,720.06x = 191,432.90 × 78,310.33
  4. Step 4: Simplify right side
    138,720.06x = 14,991,173,289.05
  5. Step 5: Solve for x
    x = 14,991,173,289.05/138,720.06
  6. Step 6: Final answer
    x = 108,067.81

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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.