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Finding the Fourth Proportional to 450.21, 671.79 and 391.89

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Solution

The fourth proportional to 450.21, 671.79 and 391.89 is: 584.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    450.21 : 671.79 = 391.89 : x
  2. Step 2: Convert to fraction form
    450.21/671.79 = 391.89/x
  3. Step 3: Cross multiply
    450.21x = 671.79 × 391.89
  4. Step 4: Simplify right side
    450.21x = 263,267.78
  5. Step 5: Solve for x
    x = 263,267.78/450.21
  6. Step 6: Final answer
    x = 584.77

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.