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Finding the Fourth Proportional to 138,912.32, 191,699.51 and 75,249.96

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Solution

The fourth proportional to 138,912.32, 191,699.51 and 75,249.96 is: 103,845.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,912.32 : 191,699.51 = 75,249.96 : x
  2. Step 2: Convert to fraction form
    138,912.32/191,699.51 = 75,249.96/x
  3. Step 3: Cross multiply
    138,912.32x = 191,699.51 × 75,249.96
  4. Step 4: Simplify right side
    138,912.32x = 14,425,380,459.52
  5. Step 5: Solve for x
    x = 14,425,380,459.52/138,912.32
  6. Step 6: Final answer
    x = 103,845.22

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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.