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Finding the Fourth Proportional to 396,724.80, 547,479.60 and 217,876.80

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Solution

The fourth proportional to 396,724.80, 547,479.60 and 217,876.80 is: 300,669.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,724.80 : 547,479.60 = 217,876.80 : x
  2. Step 2: Convert to fraction form
    396,724.80/547,479.60 = 217,876.80/x
  3. Step 3: Cross multiply
    396,724.80x = 547,479.60 × 217,876.80
  4. Step 4: Simplify right side
    396,724.80x = 119,283,103,313.28
  5. Step 5: Solve for x
    x = 119,283,103,313.28/396,724.80
  6. Step 6: Final answer
    x = 300,669.64

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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.