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Finding the Fourth Proportional to 85,138.79, 127,664.46 and 45,729.05

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Solution

The fourth proportional to 85,138.79, 127,664.46 and 45,729.05 is: 68,570.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,138.79 : 127,664.46 = 45,729.05 : x
  2. Step 2: Convert to fraction form
    85,138.79/127,664.46 = 45,729.05/x
  3. Step 3: Cross multiply
    85,138.79x = 127,664.46 × 45,729.05
  4. Step 4: Simplify right side
    85,138.79x = 5,837,974,474.56
  5. Step 5: Solve for x
    x = 5,837,974,474.56/85,138.79
  6. Step 6: Final answer
    x = 68,570.09

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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.