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Finding the Fourth Proportional to 671.09, 926.11 and 391.48

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Solution

The fourth proportional to 671.09, 926.11 and 391.48 is: 540.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.09 : 926.11 = 391.48 : x
  2. Step 2: Convert to fraction form
    671.09/926.11 = 391.48/x
  3. Step 3: Cross multiply
    671.09x = 926.11 × 391.48
  4. Step 4: Simplify right side
    671.09x = 362,555.83
  5. Step 5: Solve for x
    x = 362,555.83/671.09
  6. Step 6: Final answer
    x = 540.25

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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.