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Finding the Fourth Proportional to 671.21, 926.10 and 391.27

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Solution

The fourth proportional to 671.21, 926.10 and 391.27 is: 539.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.21 : 926.10 = 391.27 : x
  2. Step 2: Convert to fraction form
    671.21/926.10 = 391.27/x
  3. Step 3: Cross multiply
    671.21x = 926.10 × 391.27
  4. Step 4: Simplify right side
    671.21x = 362,352.83
  5. Step 5: Solve for x
    x = 362,352.83/671.21
  6. Step 6: Final answer
    x = 539.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.