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Finding the Fourth Proportional to 667.72, 1,001.16 and 378.76

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Solution

The fourth proportional to 667.72, 1,001.16 and 378.76 is: 567.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.72 : 1,001.16 = 378.76 : x
  2. Step 2: Convert to fraction form
    667.72/1,001.16 = 378.76/x
  3. Step 3: Cross multiply
    667.72x = 1,001.16 × 378.76
  4. Step 4: Simplify right side
    667.72x = 379,199.36
  5. Step 5: Solve for x
    x = 379,199.36/667.72
  6. Step 6: Final answer
    x = 567.90

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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.