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Finding the Fourth Proportional to 85,906.80, 128,705.76 and 80,842.44

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Solution

The fourth proportional to 85,906.80, 128,705.76 and 80,842.44 is: 121,118.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,906.80 : 128,705.76 = 80,842.44 : x
  2. Step 2: Convert to fraction form
    85,906.80/128,705.76 = 80,842.44/x
  3. Step 3: Cross multiply
    85,906.80x = 128,705.76 × 80,842.44
  4. Step 4: Simplify right side
    85,906.80x = 10,404,887,680.45
  5. Step 5: Solve for x
    x = 10,404,887,680.45/85,906.80
  6. Step 6: Final answer
    x = 121,118.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.