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Finding the Fourth Proportional to 971.97, 1,450.89 and 855.21

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Solution

The fourth proportional to 971.97, 1,450.89 and 855.21 is: 1,276.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.97 : 1,450.89 = 855.21 : x
  2. Step 2: Convert to fraction form
    971.97/1,450.89 = 855.21/x
  3. Step 3: Cross multiply
    971.97x = 1,450.89 × 855.21
  4. Step 4: Simplify right side
    971.97x = 1,240,815.64
  5. Step 5: Solve for x
    x = 1,240,815.64/971.97
  6. Step 6: Final answer
    x = 1,276.60

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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.