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Finding the Fourth Proportional to 81,284.80, 122,186.40 and 76,619.20

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Solution

The fourth proportional to 81,284.80, 122,186.40 and 76,619.20 is: 115,173.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,284.80 : 122,186.40 = 76,619.20 : x
  2. Step 2: Convert to fraction form
    81,284.80/122,186.40 = 76,619.20/x
  3. Step 3: Cross multiply
    81,284.80x = 122,186.40 × 76,619.20
  4. Step 4: Simplify right side
    81,284.80x = 9,361,824,218.88
  5. Step 5: Solve for x
    x = 9,361,824,218.88/81,284.80
  6. Step 6: Final answer
    x = 115,173.12

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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.