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Finding the Fourth Proportional to 438,958.56, 658,138.32 and 211,133.88

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Solution

The fourth proportional to 438,958.56, 658,138.32 and 211,133.88 is: 316,556.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,958.56 : 658,138.32 = 211,133.88 : x
  2. Step 2: Convert to fraction form
    438,958.56/658,138.32 = 211,133.88/x
  3. Step 3: Cross multiply
    438,958.56x = 658,138.32 × 211,133.88
  4. Step 4: Simplify right side
    438,958.56x = 138,955,297,078.28
  5. Step 5: Solve for x
    x = 138,955,297,078.28/438,958.56
  6. Step 6: Final answer
    x = 316,556.75

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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.