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Finding the Fourth Proportional to 665,009.76, 997,654.89 and 215,695.73

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Solution

The fourth proportional to 665,009.76, 997,654.89 and 215,695.73 is: 323,589.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,009.76 : 997,654.89 = 215,695.73 : x
  2. Step 2: Convert to fraction form
    665,009.76/997,654.89 = 215,695.73/x
  3. Step 3: Cross multiply
    665,009.76x = 997,654.89 × 215,695.73
  4. Step 4: Simplify right side
    665,009.76x = 215,189,899,786.62
  5. Step 5: Solve for x
    x = 215,189,899,786.62/665,009.76
  6. Step 6: Final answer
    x = 323,589.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.