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Finding the Fourth Proportional to 667.80, 1,001.61 and 251.28

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Solution

The fourth proportional to 667.80, 1,001.61 and 251.28 is: 376.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.80 : 1,001.61 = 251.28 : x
  2. Step 2: Convert to fraction form
    667.80/1,001.61 = 251.28/x
  3. Step 3: Cross multiply
    667.80x = 1,001.61 × 251.28
  4. Step 4: Simplify right side
    667.80x = 251,684.56
  5. Step 5: Solve for x
    x = 251,684.56/667.80
  6. Step 6: Final answer
    x = 376.89

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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.