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Finding the Fourth Proportional to 667.68, 1,001.56 and 378.56

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Solution

The fourth proportional to 667.68, 1,001.56 and 378.56 is: 567.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.68 : 1,001.56 = 378.56 : x
  2. Step 2: Convert to fraction form
    667.68/1,001.56 = 378.56/x
  3. Step 3: Cross multiply
    667.68x = 1,001.56 × 378.56
  4. Step 4: Simplify right side
    667.68x = 379,150.55
  5. Step 5: Solve for x
    x = 379,150.55/667.68
  6. Step 6: Final answer
    x = 567.86

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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.