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Finding the Fourth Proportional to 671.32, 926.28 and 391.42

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Solution

The fourth proportional to 671.32, 926.28 and 391.42 is: 540.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.32 : 926.28 = 391.42 : x
  2. Step 2: Convert to fraction form
    671.32/926.28 = 391.42/x
  3. Step 3: Cross multiply
    671.32x = 926.28 × 391.42
  4. Step 4: Simplify right side
    671.32x = 362,564.52
  5. Step 5: Solve for x
    x = 362,564.52/671.32
  6. Step 6: Final answer
    x = 540.08

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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.