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Finding the Fourth Proportional to 138,620.92, 191,260.63 and 81,229.49

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Solution

The fourth proportional to 138,620.92, 191,260.63 and 81,229.49 is: 112,075.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,620.92 : 191,260.63 = 81,229.49 : x
  2. Step 2: Convert to fraction form
    138,620.92/191,260.63 = 81,229.49/x
  3. Step 3: Cross multiply
    138,620.92x = 191,260.63 × 81,229.49
  4. Step 4: Simplify right side
    138,620.92x = 15,536,003,431.98
  5. Step 5: Solve for x
    x = 15,536,003,431.98/138,620.92
  6. Step 6: Final answer
    x = 112,075.46

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1.5x scale

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.