Home / 85,991.20-129,070.32-81,257.92

Finding the Fourth Proportional to 85,991.20, 129,070.32 and 81,257.92

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Solution

The fourth proportional to 85,991.20, 129,070.32 and 81,257.92 is: 121,965.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,991.20 : 129,070.32 = 81,257.92 : x
  2. Step 2: Convert to fraction form
    85,991.20/129,070.32 = 81,257.92/x
  3. Step 3: Cross multiply
    85,991.20x = 129,070.32 × 81,257.92
  4. Step 4: Simplify right side
    85,991.20x = 10,487,985,736.93
  5. Step 5: Solve for x
    x = 10,487,985,736.93/85,991.20
  6. Step 6: Final answer
    x = 121,965.80

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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.