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Finding the Fourth Proportional to 87,185.60, 130,778.40 and 81,936.80

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Solution

The fourth proportional to 87,185.60, 130,778.40 and 81,936.80 is: 122,905.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,185.60 : 130,778.40 = 81,936.80 : x
  2. Step 2: Convert to fraction form
    87,185.60/130,778.40 = 81,936.80/x
  3. Step 3: Cross multiply
    87,185.60x = 130,778.40 × 81,936.80
  4. Step 4: Simplify right side
    87,185.60x = 10,715,563,605.12
  5. Step 5: Solve for x
    x = 10,715,563,605.12/87,185.60
  6. Step 6: Final answer
    x = 122,905.20

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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.