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Finding the Fourth Proportional to 86,073.88, 128,245.70 and 81,239.44

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Solution

The fourth proportional to 86,073.88, 128,245.70 and 81,239.44 is: 121,042.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,073.88 : 128,245.70 = 81,239.44 : x
  2. Step 2: Convert to fraction form
    86,073.88/128,245.70 = 81,239.44/x
  3. Step 3: Cross multiply
    86,073.88x = 128,245.70 × 81,239.44
  4. Step 4: Simplify right side
    86,073.88x = 10,418,608,850.41
  5. Step 5: Solve for x
    x = 10,418,608,850.41/86,073.88
  6. Step 6: Final answer
    x = 121,042.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.