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Finding the Fourth Proportional to 259,715.70, 389,585.70 and 82,236.60

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Solution

The fourth proportional to 259,715.70, 389,585.70 and 82,236.60 is: 123,358.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,715.70 : 389,585.70 = 82,236.60 : x
  2. Step 2: Convert to fraction form
    259,715.70/389,585.70 = 82,236.60/x
  3. Step 3: Cross multiply
    259,715.70x = 389,585.70 × 82,236.60
  4. Step 4: Simplify right side
    259,715.70x = 32,038,203,376.62
  5. Step 5: Solve for x
    x = 32,038,203,376.62/259,715.70
  6. Step 6: Final answer
    x = 123,358.75

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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.