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Finding the Fourth Proportional to 142,753.71, 196,991.55 and 79,086.90

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Solution

The fourth proportional to 142,753.71, 196,991.55 and 79,086.90 is: 109,135.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,753.71 : 196,991.55 = 79,086.90 : x
  2. Step 2: Convert to fraction form
    142,753.71/196,991.55 = 79,086.90/x
  3. Step 3: Cross multiply
    142,753.71x = 196,991.55 × 79,086.90
  4. Step 4: Simplify right side
    142,753.71x = 15,579,451,015.70
  5. Step 5: Solve for x
    x = 15,579,451,015.70/142,753.71
  6. Step 6: Final answer
    x = 109,135.17

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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.