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Finding the Fourth Proportional to 1,214.73, 1,676.70 and 821.75

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Solution

The fourth proportional to 1,214.73, 1,676.70 and 821.75 is: 1,134.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214.73 : 1,676.70 = 821.75 : x
  2. Step 2: Convert to fraction form
    1,214.73/1,676.70 = 821.75/x
  3. Step 3: Cross multiply
    1,214.73x = 1,676.70 × 821.75
  4. Step 4: Simplify right side
    1,214.73x = 1,377,819.84
  5. Step 5: Solve for x
    x = 1,377,819.84/1,214.73
  6. Step 6: Final answer
    x = 1,134.26

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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.