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Finding the Fourth Proportional to 671.00, 925.61 and 391.21

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Solution

The fourth proportional to 671.00, 925.61 and 391.21 is: 539.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.00 : 925.61 = 391.21 : x
  2. Step 2: Convert to fraction form
    671.00/925.61 = 391.21/x
  3. Step 3: Cross multiply
    671.00x = 925.61 × 391.21
  4. Step 4: Simplify right side
    671.00x = 362,103.62
  5. Step 5: Solve for x
    x = 362,103.62/671.00
  6. Step 6: Final answer
    x = 539.65

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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.