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Finding the Fourth Proportional to 1,212.92, 1,674.02 and 741.09

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Solution

The fourth proportional to 1,212.92, 1,674.02 and 741.09 is: 1,022.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.92 : 1,674.02 = 741.09 : x
  2. Step 2: Convert to fraction form
    1,212.92/1,674.02 = 741.09/x
  3. Step 3: Cross multiply
    1,212.92x = 1,674.02 × 741.09
  4. Step 4: Simplify right side
    1,212.92x = 1,240,595.78
  5. Step 5: Solve for x
    x = 1,240,595.78/1,212.92
  6. Step 6: Final answer
    x = 1,022.82

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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.