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Finding the Fourth Proportional to 137,628.98, 189,967.29 and 81,072.98

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Solution

The fourth proportional to 137,628.98, 189,967.29 and 81,072.98 is: 111,903.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,628.98 : 189,967.29 = 81,072.98 : x
  2. Step 2: Convert to fraction form
    137,628.98/189,967.29 = 81,072.98/x
  3. Step 3: Cross multiply
    137,628.98x = 189,967.29 × 81,072.98
  4. Step 4: Simplify right side
    137,628.98x = 15,401,214,302.82
  5. Step 5: Solve for x
    x = 15,401,214,302.82/137,628.98
  6. Step 6: Final answer
    x = 111,903.86

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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.