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Finding the Fourth Proportional to 99,418.94, 149,128.39 and 36,243.80

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Solution

The fourth proportional to 99,418.94, 149,128.39 and 36,243.80 is: 54,365.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,418.94 : 149,128.39 = 36,243.80 : x
  2. Step 2: Convert to fraction form
    99,418.94/149,128.39 = 36,243.80/x
  3. Step 3: Cross multiply
    99,418.94x = 149,128.39 × 36,243.80
  4. Step 4: Simplify right side
    99,418.94x = 5,404,979,541.48
  5. Step 5: Solve for x
    x = 5,404,979,541.48/99,418.94
  6. Step 6: Final answer
    x = 54,365.69

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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.