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Finding the Fourth Proportional to 90,731.82, 135,996.87 and 68,473.02

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Solution

The fourth proportional to 90,731.82, 135,996.87 and 68,473.02 is: 102,633.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,731.82 : 135,996.87 = 68,473.02 : x
  2. Step 2: Convert to fraction form
    90,731.82/135,996.87 = 68,473.02/x
  3. Step 3: Cross multiply
    90,731.82x = 135,996.87 × 68,473.02
  4. Step 4: Simplify right side
    90,731.82x = 9,312,116,399.45
  5. Step 5: Solve for x
    x = 9,312,116,399.45/90,731.82
  6. Step 6: Final answer
    x = 102,633.41

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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.