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Finding the Fourth Proportional to 451.21, 676.70 and 191.06

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Solution

The fourth proportional to 451.21, 676.70 and 191.06 is: 286.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.21 : 676.70 = 191.06 : x
  2. Step 2: Convert to fraction form
    451.21/676.70 = 191.06/x
  3. Step 3: Cross multiply
    451.21x = 676.70 × 191.06
  4. Step 4: Simplify right side
    451.21x = 129,292.47
  5. Step 5: Solve for x
    x = 129,292.47/451.21
  6. Step 6: Final answer
    x = 286.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.