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Finding the Fourth Proportional to 671.84, 926.94 and 392

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Solution

The fourth proportional to 671.84, 926.94 and 392 is: 540.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.84 : 926.94 = 392 : x
  2. Step 2: Convert to fraction form
    671.84/926.94 = 392/x
  3. Step 3: Cross multiply
    671.84x = 926.94 × 392
  4. Step 4: Simplify right side
    671.84x = 363,360.48
  5. Step 5: Solve for x
    x = 363,360.48/671.84
  6. Step 6: Final answer
    x = 540.84

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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.