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Finding the Fourth Proportional to 671, 1,005.81 and 378.64

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Solution

The fourth proportional to 671, 1,005.81 and 378.64 is: 567.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    671 : 1,005.81 = 378.64 : x
  2. Step 2: Convert to fraction form
    671/1,005.81 = 378.64/x
  3. Step 3: Cross multiply
    671x = 1,005.81 × 378.64
  4. Step 4: Simplify right side
    671x = 380,838.01
  5. Step 5: Solve for x
    x = 380,838.01/671
  6. Step 6: Final answer
    x = 567.57

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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.