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Finding the Fourth Proportional to 671.29, 926.31 and 391.48

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Solution

The fourth proportional to 671.29, 926.31 and 391.48 is: 540.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.29 : 926.31 = 391.48 : x
  2. Step 2: Convert to fraction form
    671.29/926.31 = 391.48/x
  3. Step 3: Cross multiply
    671.29x = 926.31 × 391.48
  4. Step 4: Simplify right side
    671.29x = 362,631.84
  5. Step 5: Solve for x
    x = 362,631.84/671.29
  6. Step 6: Final answer
    x = 540.20

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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.