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Finding the Fourth Proportional to 138,171.45, 190,699.47 and 87,211.92

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Solution

The fourth proportional to 138,171.45, 190,699.47 and 87,211.92 is: 120,366.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,171.45 : 190,699.47 = 87,211.92 : x
  2. Step 2: Convert to fraction form
    138,171.45/190,699.47 = 87,211.92/x
  3. Step 3: Cross multiply
    138,171.45x = 190,699.47 × 87,211.92
  4. Step 4: Simplify right side
    138,171.45x = 16,631,266,921.68
  5. Step 5: Solve for x
    x = 16,631,266,921.68/138,171.45
  6. Step 6: Final answer
    x = 120,366.88

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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.