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Finding the Fourth Proportional to 138,912.19, 191,699.72 and 75,249.94

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Solution

The fourth proportional to 138,912.19, 191,699.72 and 75,249.94 is: 103,845.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,912.19 : 191,699.72 = 75,249.94 : x
  2. Step 2: Convert to fraction form
    138,912.19/191,699.72 = 75,249.94/x
  3. Step 3: Cross multiply
    138,912.19x = 191,699.72 × 75,249.94
  4. Step 4: Simplify right side
    138,912.19x = 14,425,392,428.02
  5. Step 5: Solve for x
    x = 14,425,392,428.02/138,912.19
  6. Step 6: Final answer
    x = 103,845.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.