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Finding the Fourth Proportional to 971.21, 1,454.14 and 679

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Solution

The fourth proportional to 971.21, 1,454.14 and 679 is: 1,016.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.21 : 1,454.14 = 679 : x
  2. Step 2: Convert to fraction form
    971.21/1,454.14 = 679/x
  3. Step 3: Cross multiply
    971.21x = 1,454.14 × 679
  4. Step 4: Simplify right side
    971.21x = 987,361.06
  5. Step 5: Solve for x
    x = 987,361.06/971.21
  6. Step 6: Final answer
    x = 1,016.63

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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.