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Finding the Fourth Proportional to 137,579.82, 189,779.70 and 86,511.70

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Solution

The fourth proportional to 137,579.82, 189,779.70 and 86,511.70 is: 119,335.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,579.82 : 189,779.70 = 86,511.70 : x
  2. Step 2: Convert to fraction form
    137,579.82/189,779.70 = 86,511.70/x
  3. Step 3: Cross multiply
    137,579.82x = 189,779.70 × 86,511.70
  4. Step 4: Simplify right side
    137,579.82x = 16,418,164,472.49
  5. Step 5: Solve for x
    x = 16,418,164,472.49/137,579.82
  6. Step 6: Final answer
    x = 119,335.56

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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.