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Finding the Fourth Proportional to 81,849.70, 122,774.55 and 68,716.90

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Solution

The fourth proportional to 81,849.70, 122,774.55 and 68,716.90 is: 103,075.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,849.70 : 122,774.55 = 68,716.90 : x
  2. Step 2: Convert to fraction form
    81,849.70/122,774.55 = 68,716.90/x
  3. Step 3: Cross multiply
    81,849.70x = 122,774.55 × 68,716.90
  4. Step 4: Simplify right side
    81,849.70x = 8,436,686,474.90
  5. Step 5: Solve for x
    x = 8,436,686,474.90/81,849.70
  6. Step 6: Final answer
    x = 103,075.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.