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Finding the Fourth Proportional to 138,785.58, 191,481.75 and 85,050.90

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Solution

The fourth proportional to 138,785.58, 191,481.75 and 85,050.90 is: 117,344.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,785.58 : 191,481.75 = 85,050.90 : x
  2. Step 2: Convert to fraction form
    138,785.58/191,481.75 = 85,050.90/x
  3. Step 3: Cross multiply
    138,785.58x = 191,481.75 × 85,050.90
  4. Step 4: Simplify right side
    138,785.58x = 16,285,695,171.08
  5. Step 5: Solve for x
    x = 16,285,695,171.08/138,785.58
  6. Step 6: Final answer
    x = 117,344.29

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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.