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Finding the Fourth Proportional to 671.89, 927.21 and 439.42

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Solution

The fourth proportional to 671.89, 927.21 and 439.42 is: 606.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.89 : 927.21 = 439.42 : x
  2. Step 2: Convert to fraction form
    671.89/927.21 = 439.42/x
  3. Step 3: Cross multiply
    671.89x = 927.21 × 439.42
  4. Step 4: Simplify right side
    671.89x = 407,434.62
  5. Step 5: Solve for x
    x = 407,434.62/671.89
  6. Step 6: Final answer
    x = 606.40

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1.5x scale

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.