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Finding the Fourth Proportional to 259,640.40, 389,431.80 and 212,811.60

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Solution

The fourth proportional to 259,640.40, 389,431.80 and 212,811.60 is: 319,193.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,640.40 : 389,431.80 = 212,811.60 : x
  2. Step 2: Convert to fraction form
    259,640.40/389,431.80 = 212,811.60/x
  3. Step 3: Cross multiply
    259,640.40x = 389,431.80 × 212,811.60
  4. Step 4: Simplify right side
    259,640.40x = 82,875,604,448.88
  5. Step 5: Solve for x
    x = 82,875,604,448.88/259,640.40
  6. Step 6: Final answer
    x = 319,193.79

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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.