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Finding the Fourth Proportional to 396,507.56, 547,165.78 and 215,215.64

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Solution

The fourth proportional to 396,507.56, 547,165.78 and 215,215.64 is: 296,989.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,507.56 : 547,165.78 = 215,215.64 : x
  2. Step 2: Convert to fraction form
    396,507.56/547,165.78 = 215,215.64/x
  3. Step 3: Cross multiply
    396,507.56x = 547,165.78 × 215,215.64
  4. Step 4: Simplify right side
    396,507.56x = 117,758,633,528.80
  5. Step 5: Solve for x
    x = 117,758,633,528.80/396,507.56
  6. Step 6: Final answer
    x = 296,989.63

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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.