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Finding the Fourth Proportional to 671.05, 925.96 and 391.35

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Solution

The fourth proportional to 671.05, 925.96 and 391.35 is: 540.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.05 : 925.96 = 391.35 : x
  2. Step 2: Convert to fraction form
    671.05/925.96 = 391.35/x
  3. Step 3: Cross multiply
    671.05x = 925.96 × 391.35
  4. Step 4: Simplify right side
    671.05x = 362,374.45
  5. Step 5: Solve for x
    x = 362,374.45/671.05
  6. Step 6: Final answer
    x = 540.01

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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.