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Finding the Fourth Proportional to 1,212.96, 1,676.12 and 917.72

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Solution

The fourth proportional to 1,212.96, 1,676.12 and 917.72 is: 1,268.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.96 : 1,676.12 = 917.72 : x
  2. Step 2: Convert to fraction form
    1,212.96/1,676.12 = 917.72/x
  3. Step 3: Cross multiply
    1,212.96x = 1,676.12 × 917.72
  4. Step 4: Simplify right side
    1,212.96x = 1,538,208.85
  5. Step 5: Solve for x
    x = 1,538,208.85/1,212.96
  6. Step 6: Final answer
    x = 1,268.14

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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.