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Finding the Fourth Proportional to 1,214.82, 1,676.57 and 865.71

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Solution

The fourth proportional to 1,214.82, 1,676.57 and 865.71 is: 1,194.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214.82 : 1,676.57 = 865.71 : x
  2. Step 2: Convert to fraction form
    1,214.82/1,676.57 = 865.71/x
  3. Step 3: Cross multiply
    1,214.82x = 1,676.57 × 865.71
  4. Step 4: Simplify right side
    1,214.82x = 1,451,419.09
  5. Step 5: Solve for x
    x = 1,451,419.09/1,214.82
  6. Step 6: Final answer
    x = 1,194.76

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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.