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Finding the Fourth Proportional to 396,419.56, 547,046.06 and 221,989.84

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Solution

The fourth proportional to 396,419.56, 547,046.06 and 221,989.84 is: 306,338.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,419.56 : 547,046.06 = 221,989.84 : x
  2. Step 2: Convert to fraction form
    396,419.56/547,046.06 = 221,989.84/x
  3. Step 3: Cross multiply
    396,419.56x = 547,046.06 × 221,989.84
  4. Step 4: Simplify right side
    396,419.56x = 121,438,667,332.03
  5. Step 5: Solve for x
    x = 121,438,667,332.03/396,419.56
  6. Step 6: Final answer
    x = 306,338.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.