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Finding the Fourth Proportional to 396,500.81, 547,171.79 and 215,212.79

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Solution

The fourth proportional to 396,500.81, 547,171.79 and 215,212.79 is: 296,994.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,500.81 : 547,171.79 = 215,212.79 : x
  2. Step 2: Convert to fraction form
    396,500.81/547,171.79 = 215,212.79/x
  3. Step 3: Cross multiply
    396,500.81x = 547,171.79 × 215,212.79
  4. Step 4: Simplify right side
    396,500.81x = 117,758,365,959.79
  5. Step 5: Solve for x
    x = 117,758,365,959.79/396,500.81
  6. Step 6: Final answer
    x = 296,994.01

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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.