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Finding the Fourth Proportional to 664,391.40, 996,745.49 and 215,112.41

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Solution

The fourth proportional to 664,391.40, 996,745.49 and 215,112.41 is: 322,719.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,391.40 : 996,745.49 = 215,112.41 : x
  2. Step 2: Convert to fraction form
    664,391.40/996,745.49 = 215,112.41/x
  3. Step 3: Cross multiply
    664,391.40x = 996,745.49 × 215,112.41
  4. Step 4: Simplify right side
    664,391.40x = 214,412,319,526.80
  5. Step 5: Solve for x
    x = 214,412,319,526.80/664,391.40
  6. Step 6: Final answer
    x = 322,719.89

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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.