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Finding the Fourth Proportional to 396,407.78, 547,043.08 and 215,119.71

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Solution

The fourth proportional to 396,407.78, 547,043.08 and 215,119.71 is: 296,865.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,407.78 : 547,043.08 = 215,119.71 : x
  2. Step 2: Convert to fraction form
    396,407.78/547,043.08 = 215,119.71/x
  3. Step 3: Cross multiply
    396,407.78x = 547,043.08 × 215,119.71
  4. Step 4: Simplify right side
    396,407.78x = 117,679,745,991.89
  5. Step 5: Solve for x
    x = 117,679,745,991.89/396,407.78
  6. Step 6: Final answer
    x = 296,865.38

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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.