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Finding the Fourth Proportional to 671.57, 926.60 and 391.64

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Solution

The fourth proportional to 671.57, 926.60 and 391.64 is: 540.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.57 : 926.60 = 391.64 : x
  2. Step 2: Convert to fraction form
    671.57/926.60 = 391.64/x
  3. Step 3: Cross multiply
    671.57x = 926.60 × 391.64
  4. Step 4: Simplify right side
    671.57x = 362,887.03
  5. Step 5: Solve for x
    x = 362,887.03/671.57
  6. Step 6: Final answer
    x = 540.36

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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.