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Finding the Fourth Proportional to 138,692.44, 191,401.01 and 81,323.79

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Solution

The fourth proportional to 138,692.44, 191,401.01 and 81,323.79 is: 112,230.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,692.44 : 191,401.01 = 81,323.79 : x
  2. Step 2: Convert to fraction form
    138,692.44/191,401.01 = 81,323.79/x
  3. Step 3: Cross multiply
    138,692.44x = 191,401.01 × 81,323.79
  4. Step 4: Simplify right side
    138,692.44x = 15,565,454,179.40
  5. Step 5: Solve for x
    x = 15,565,454,179.40/138,692.44
  6. Step 6: Final answer
    x = 112,230.01

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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.