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Finding the Fourth Proportional to 667.95, 1,000.31 and 378.51

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Solution

The fourth proportional to 667.95, 1,000.31 and 378.51 is: 566.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.95 : 1,000.31 = 378.51 : x
  2. Step 2: Convert to fraction form
    667.95/1,000.31 = 378.51/x
  3. Step 3: Cross multiply
    667.95x = 1,000.31 × 378.51
  4. Step 4: Simplify right side
    667.95x = 378,625.45
  5. Step 5: Solve for x
    x = 378,625.45/667.95
  6. Step 6: Final answer
    x = 566.85

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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.