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Finding the Fourth Proportional to 68,705.20, 103,057.80 and 66,080.80

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Solution

The fourth proportional to 68,705.20, 103,057.80 and 66,080.80 is: 99,121.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,705.20 : 103,057.80 = 66,080.80 : x
  2. Step 2: Convert to fraction form
    68,705.20/103,057.80 = 66,080.80/x
  3. Step 3: Cross multiply
    68,705.20x = 103,057.80 × 66,080.80
  4. Step 4: Simplify right side
    68,705.20x = 6,810,141,870.24
  5. Step 5: Solve for x
    x = 6,810,141,870.24/68,705.20
  6. Step 6: Final answer
    x = 99,121.20

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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.