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Finding the Fourth Proportional to 396,990.58, 547,840.34 and 215,705.28

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Solution

The fourth proportional to 396,990.58, 547,840.34 and 215,705.28 is: 297,669.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,990.58 : 547,840.34 = 215,705.28 : x
  2. Step 2: Convert to fraction form
    396,990.58/547,840.34 = 215,705.28/x
  3. Step 3: Cross multiply
    396,990.58x = 547,840.34 × 215,705.28
  4. Step 4: Simplify right side
    396,990.58x = 118,172,053,935.00
  5. Step 5: Solve for x
    x = 118,172,053,935.00/396,990.58
  6. Step 6: Final answer
    x = 297,669.67

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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.