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Finding the Fourth Proportional to 86,991.77, 120,106.49 and 66,812.60

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Solution

The fourth proportional to 86,991.77, 120,106.49 and 66,812.60 is: 92,245.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,991.77 : 120,106.49 = 66,812.60 : x
  2. Step 2: Convert to fraction form
    86,991.77/120,106.49 = 66,812.60/x
  3. Step 3: Cross multiply
    86,991.77x = 120,106.49 × 66,812.60
  4. Step 4: Simplify right side
    86,991.77x = 8,024,625,939.18
  5. Step 5: Solve for x
    x = 8,024,625,939.18/86,991.77
  6. Step 6: Final answer
    x = 92,245.81

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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.