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Finding the Fourth Proportional to 137,676.78, 189,986.31 and 77,241.87

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Solution

The fourth proportional to 137,676.78, 189,986.31 and 77,241.87 is: 106,589.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,676.78 : 189,986.31 = 77,241.87 : x
  2. Step 2: Convert to fraction form
    137,676.78/189,986.31 = 77,241.87/x
  3. Step 3: Cross multiply
    137,676.78x = 189,986.31 × 77,241.87
  4. Step 4: Simplify right side
    137,676.78x = 14,674,897,858.80
  5. Step 5: Solve for x
    x = 14,674,897,858.80/137,676.78
  6. Step 6: Final answer
    x = 106,589.49

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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.