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Finding the Fourth Proportional to 100,361.44, 149,665.12 and 87,939.28

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Solution

The fourth proportional to 100,361.44, 149,665.12 and 87,939.28 is: 131,140.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,361.44 : 149,665.12 = 87,939.28 : x
  2. Step 2: Convert to fraction form
    100,361.44/149,665.12 = 87,939.28/x
  3. Step 3: Cross multiply
    100,361.44x = 149,665.12 × 87,939.28
  4. Step 4: Simplify right side
    100,361.44x = 13,161,442,893.91
  5. Step 5: Solve for x
    x = 13,161,442,893.91/100,361.44
  6. Step 6: Final answer
    x = 131,140.43

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.